09x18 - Drain Disaster

[bunniefuu]

Please don't try anything are you about to see at home.

We're what you call experts.

On this episode of "Mytbusters"--

Two, one, go--

Awesome.

Adam and Jamie get down and dirty...

I've never seen anything like that.

testing out an expl*si*n inside a sewer--

The sewer's getting pretty full of methane.

turns manhole covers into missiles.

It's k*lling me.

Then, Kari, Tory and Grant take on the fun fabel

Love when I get to drive.

that trucks bedliner is indestructable

with car crashes

I'm okay.

angry attack dogs,

and ends with a bang finale,

can bedliner really save your life?

A lot of people ask me,

do you ever get tired of blowing stuff up.

I tell them no.

Who are the Mythbusters?

Adam Savage.

Am I missing an eyebrow?

And Jamie Hyneman.

Things are getting start a little crazy here.

Between them, more than 30 years of special-effects experience.

Together with Kari Byron,

I'm going to wreck this car.

Tory Belleci--

We survived.

and Grant Imahara--

Save yourself!

They don't just tell the myths.

They put them to the test.

So is every story we do an excuse for you to wear a

funny hat?

You should know the answer to that by now,

although specifically in this story it's quite apt

because we're doing a myth about sewers.

You mean like from a methane build-up?

Yes, but not just methane explosions

it's about during a methane expl*si*n

do the manhole covers above the street,

above the sewer, get blown high into the air?

That sounds like a classic,

It's perfect for us.

I totally agree.

It's no myth that the decay of waste inside sewers

makes them the perfect breeding ground for combustion.

However, could a stray spark trigger an epic expl*si*n

and send manhole covers skyrocketing?

Could a manhole ever turn m*ssile?

What's the plan?

Well, it seems clear to me that

this has to end with us testing it full scale.

We need full-size manhole covers over a real sewer.

I agree. But you know what,

before we lock in on a full-size plan,

Let's do a small-squall one first

and see if we can learn anything.

Sounds like a good idea.

This ought to do it.

So to find out if a methane kaboom can make manholes fly,

the mythbusters get their minds into the sewer.

This is a schedule 80 steel pipe,

and I'm about to make it into a miniature sewer

with a viewing port all along one side

which is hopefully going to be expl*si*n-proof.

This cumbersome pipe

should hopefully replicate a sewer in miniature,

but with great weight comes great responsibility.

You see us build a lot of stuff on this show.

And a lot of times it seems kind of like jazz.

We are really just figuring it out as we go along.

It's beautiful.

but when you're build something this heavy and substantial,

you can't quite do it that way.

You actually have to plan two or three steps ahead.

Let's weld this puppy down.

Because everything you're doing and

everything you're going to do is going to require

moving hundred of pounds of steel around.

Oh, this is heavy.

Not only will it make it logistically difficult,

but finger can be lost, eyes can be poked out.

It's dangerous.

Watch your fingers.

It's lovely.

Yeah, it is.

I can't believe this is a small scale.

It may be big,

Perfect.

but to a stand methane expl*si*n it has to be.

And to complete the authentic aesthetic,

Jamie need to make these.

That's the manhole cover.

It's clearly in a sewer there's also waste,

human waste, household some waste.

And those wastes produce the dangerous gases

that can lead to an expl*si*n.

That's not how we're creating our gases.

Now, we're calling up the store

and bringing in methane and pumping it in.

But remember, methane is tricky.

It requires a precise ratio of air to gas in order to explode.



that's exactly the ratio that we'll be using today.

Why?

Because this myth isn't really about

the circumstances that lead to an expl*si*n.

It's about what happens afterwards.

The question we're answering is

will those manhole covers fly sky high?

To find that out,

Adam and Jamie are going to test

a series of potentially expl*sive sewer scenarios.

The first test is the most standard sewer setup--

an open-ended system.

Here's how this procedure is going to go down.

First, we fill our chamber with this -- methane.

Exactly .12 cubic feet, or stoichiometry of



All right, you ready? I'm going to turn on the gas.

I'm ready.

Okay.

That gas will flow into the chamber until

it's the correct amount, then we shut off all the valves.

Then we mix the air and the gas with this--

this little whisper fan.

We turn on this fan for exactly two minutes,

let the air and the gas get together.

Nice looking rig.

Yeah.

that might be in the running for

the heaviest small-scale thing we've ever built.

At that point, we will plug in this neon transformer,

set the spark, and hopeful ever --

getting the manhole cover launch of our dreams.

But will the free flow of air and

gas in the open-ended sewer mean the manholes fly?

This is drain disaster,

open system

in three, two, one, go.

That was totally boring.

Like--

Wait. Let me do that again. Hold on--

Despite igniting methane at its expl*sive ratio,

the manhole covers didn't get air.

Manhole cover check one, two, three,

all still on.

I don't think an open system is that energetic.

No.

And the reason for that lethargic blast?

Well, for that, it's over to the Hyneman.

Think of this like a g*n.

If the back of the barrel is closed,

then the exploding gunpowder goes this way and

pushes the b*llet out the end of the barrel.

However, if that breach is open,

the the gas is going to follow path of

least resistance and escape here.

And it's not going to do anything to the b*llet.

It's not looking good for the open system.

But this myth doesn't rest there.

I'm making a mess for science.

There's a whole lot more manhole mayhem to come.

Next up is a fan favorite with three times the carnage.

All right, you guys are familiar with bedliners, right?

Yeah, the stuff you spray on your pickup truck bed

to protect it.

Right. Now officially it's minimumly to stop scratches,

dents, and rust.

But unofficially, people are claiming

that it is practically indestructable.

Yeah, there's all kinds of crazy stuff on the fans sites,

that you can make it dog-proof,

you can make it car crash-proof,

you can make it house blast-proof.

And soon we're taking most damages and testing, right?

Exactly.

Bedlineders, used to line the beds of trucks and

protect against dings and scratches.

According to fans, that's not all.

Supposedly it can defend against damage in

a host of unconventional conditions.

So we're gonna be working with attacking dogs,

crashing cars and exploding houses?

I think I love this myth already.

Before we get too far,

let's find out what the bedliners made up

and how it performs under normal condition.

Buzz k*ll.

Science.

You want to find out about bedliner?

I've got a few questions.

First it's time to bed down

and find out just how this stuff works.

Mark, what exactly is bedliners?

The bedliner material is of two component,

polyurethane, polyurea, elastic mirror coating.

What is it normally used for?

You'll find the coatings do very well

with there's a high abrasion,

where typical paints will not hold up.

So the applications are endless.

Yeah, but if you drove it through an expl*si*n

or have it attacked by dogs --

Not today, no.

Right, so bedliner is really only designed

to guard against dings and scratches.

So, now to get started on

what the fans claim it can do.

Number one, can bedliner make your car crash-proof?

To find that out, they've got a car.

Now to give it a very special paint job.

We're going to spray half of this car with bedliner

and leave the other half completely clean.

This car has not been any accidents and

there's not a dent on it.

So we're starting from scratch.

With the aid of the bedliner ninjas

and the time-lapse camera,

in no time at all--

This is totally cured.

That's amazing.

All right, you gonna in the unsafe side.

I'm driving.

All right.

See the abrasion resistant.

Abrasion resistant may be,

but it find out if it's crash-proof,

it's time to-- well, crash it.

I don't like car pooling, can we not car pool any more?

Love when I get to drive.

We're going to simulate a minor fender-bender.

To do that we're going to back our car in

the treated and untreated side,

into this barrier at six miles an hour.

We want to get minor damage

and compare the differences.

Yep, and six miles per hour

still equates to a 5,000 joules impact.

Okay, this is the six miles per hour rear bumper test.

Here we go.

First on the untreated side--

You got all of that one.

A little more violent than I expected.

...and then the bedliner side.

Nice job, man.

I don't think I'll ever get used to that.

Grant's no fan of rear-enders,

but it does seem like the bedliner did take the strain.

You know what, I'm going to have to say

that was a win for the bedliner.

Look at this, it's still intact.

Dude, that's crazy.

The untreated bumper is shattered,

while the bedliner is practically untouched.

But can it survive a six mile-per-hour as*ault

from the front?

This is going to be funny.

My god, what are you, blind?

Just kidding.

All right. That was a good hit.

I'm okay.

Human crash test dummy.

That was a solid hit,

and it looks like the bedliner wins again. Dude.

Look, we have cracking here and here.

But none on the bedliner side.

That is totally amazing.

And that's some huge damage right there.

There is damage, but a collision of six miles per hour

is relatively tame compared to

what's coming up next.

On the other side of the break,

Tory putting pedal to the metal.

Oh, my god, that was so fun.

Later it's Adam and Jamie

and the great drain disaster.

That sewer's getting pretty full of methane.

In this drain disaster,

supposedly a sewer expl*si*n sends manhole covers sky high.

However with their open-ended system,

that wasn't the case

as the expl*si*n took the path of least resistance.

So for the next test

the mythbusters are closing the sewer,

and that's not as crazy as it sounds.

There are many places

in which a sewer can become a closed system.

You can have a large pipe that

immediately makes a right-angle turn into a small pipe.

Gases have a hard time going around corners like that

when they're under pressure.

You can have a part of the sewer

above water with a bunch of the sewer under water.

All of a sudden, that becomes a closed system.

But, will a methane expl*si*n in a closed sewer,

make the difference and send the manhole cover sky high?

Three, two, one, go.

Awesome!

Go.

Apparently yes.

All that holecovers went

and it sounded cool, too.

The high-speed reverie proves that not only did

the lids flip but they got significant air.

Would that worked pretty much exactly as we hoped it would.

And here's what's going on in there.

The reason those manhole covers start to fly

before the fire even gets to them

is the fire is an expanding gas.

And it is pushing air ahead of it, like a piston.

That piston is causing an increase in pressure

which is released by the manhole cover flying.

That's what we wanted to see.

Go.

The closed sewer scenario may have achieved manhole flight,

but there's one more parameter for the guys

to test inside their small-scale drain.

I'm making a mess for science.

This is the way it's supposed to look.

That's right, they're adding debris

because more junk might lead to a bigger kathunk.

You might be looking at this

and thinking how is your chamber full of springs

and coil wire anything remote you approaching

a real-world scenario?

How does that kind of blockage occur in a real sewer?

Well, actually it does.

Real sewers have all sort of

things like remnants of workers working on them,

spools of wire, ladders, equipment,

things that washed into the sewer,

different sizes of pipes in the sewer that actually change

and constrict the air flow.

This kind of thing can absolutely happen inside a sewer.

And with the springs providing 20% blockag

will they put a spring in the step of the manholes?

Here we go, drain disaster, small scale, 20% destruction,

single-ignition source,

in three, two, one, go.

The scattering of springs accelerated

the burn for the most dramatic drain expl*si*n so far.

Wow, look at that.

How fast it moves.

I never seen anything like that.

That is like a fireworks show.

That was amazing.

So what's happening here?

Well, if you look at the unblocked burn,

You'll see that the flame front is taking up

maybe in this case about a quarter of a square foot.

It's moving out spherically from the ignition source.

But, looking at the blocked burn,

you'll see that the frame begins to wrinkle

the minute it meets the obstructions that we put in the chamber.

That wrinkling creates a larger surface area,

maybe several square feet for all we know.

But the end result is that the flame front is

able to accelerate much more quickly throughout the burn.

And it leaves the other one behind at the same time.

Go.

And that speedy flame front creates the pressure

that propels the manhole covers sky high.

Up over 36 inches, number three. number two, and number one

And they're off the scale.

Freaking awesome.

Well, that's what we need to do in the close-ups.

I think we have our testing parameters.

Kari, Tory, and Grant are on a collision course

finding out if a truck bedliner

can make your car crash-proof.

So far it's looking good.

Look, we have cracking here and here,

but none on the bedliner side.

That is totally amazing.

All right.

We've already established that bedliner

works pretty well for low-speed crashes.

But now it's time to put it through the ultimate test.

A high-speed crash.

For that Tory's going to ram.

All right Tory, Whenever you are ready.

Tory's going to ram both sides of the car at 20 miles per hour.

Or with an impact force of 50,000 joules.

Nice.

Remember, this is for science

and Tory is not enjoying himself at all.

Oh, my God. That was so much fun.

What's red and white and dented all over?

Nice.

After both impacts, the difference between the

control and coated side is negligible.

Check it out.

That's some pretty good damage there.

Looks better on this side.

Yeah.

I mean, barely.

You know, this is still busted

because it's definitely not crash-proof.

All right. Yeah.

It helped a little bit but didn't do it.

Good work, man.

Now the fans claim that bedliner is indestructable.

You coat your car in it,

it's not only dent resistant but it's crash-proof.

I think we've proved them wrong on that.

Anything small, abrasions,

little tiny Dings, definitely helps.

But you get anything more severe, it's busted.

Crash-proof is busted.

But how about claim number two--

can you make a diy dog-proof suit with bedliner?

So to see if bedliner can actually make a fabric bite-proof,

we're going to build a dog-biting robot.

We'll find out what fabric works

the best and once we've figured all that out,

we'll bring in the real dog.

Ultimately Tory will face the jaws of faith.

But to make sure they're not barking up the wrong tree,

first robot chomp'll test if those any truth to the bedliner

being dog tooth proof.

This is an actual German shepherd skull.

Done a little bit research and found out that

the German shepherd bites down

with about 400 pounds of force.

So we're going to take a max cylinder,

put it right in this bit here,

and that way we can precisely control the speed and

the bite force until it exactly matches the real dog.

Here we go.

In three, two, one --

I'd call that successful.

And for its next meal, Kari has found these.

We're going to spray bedliner on each of these different fabrics

and see which is going to be the best for a dog-proof suit.

We have leather, denim, canvas, and a quilted jacket.

Those are the contenders,

and the winner will be coated in bedliner

and hopefully make an attack dog pause.

We're going to apply a 1/8-inch layer of bedliner.

The stuff that we have in the truck.

This got crazy to aim.

With one arm sprayed and set and

robot chomp calibrated to a scan rating of 400 pounds,

which fabric can strong-arm its bite?

Sick 'em, boy.

Control test, dog bite denim.

Here we go.

Three, two, one --

Got a nice bite.

That's a bleeder.

One --

Unsurprisingly, 400 pounds of bite force is more

than a match for the leather,

Denim, canvas, and quilted jackets.

Look at that.

But how will the bedliner fashion compare?

Okay, first up, denim.

Three, two, one --

Wow, that is strong.

Release.

Got it trained.

I don't think it penetrated.

Well, it starts out strong.

Doesn't look like there was any penetration.

Cool.

This stuff's tough.

Leather jacket.

And continues to hold out.

Not punching through?

No, not at all.

Okay, this is canvas arm with bedliner.

Oh, my gosh, this is ridiculous.

It looks like it's working.

Bedliner quilted jacket.

In fact, on every jacket,

the bedliner protects against 400 pounds of robot chomp.

Look at that, it protects the arm, as well.

Not a scratch.

That's amazing.

It looks like the fans could be right about

bedliner being a cheaper alternative to a dog-proof suit.

This coat is a little bit more padded.

I feel safer wearing this

if I'm going to let a dog attack me.

What I'm going to do now is let them coat the rest of the coat,

and then we're going to let the dog out.

Man, those high-speed shots are some of

the most beautiful things we've gotten on small scale.

Where do we stand on going full scale?

The best case scenario is

close system with lots of blockages.

Also surprisingly turns out that nobody but

nobody want to let us use a real

sewer to blow up.

Shocking.

Yeah.

I think we're going to have to make our own.

I'm thinking dig a nice big trench,

put down real sewer parts with real manhole covers

and have a go at it.

Works for me.

Three, two, one, go.

So, to upscale their best case scenario sewer,

the guys will need to get down and dirty

in Ione and build their own.

Nice, wide-open space.

Perfect to blow up a sewer.

Now, of course,

the first prerequisite of building our own sewer

is a hole.

In order to get started we're going to need to find a hole.

Here's one.

Perfect!

It's a conveniently

large hole for some

inconveniently large construction.

Our sewer is going to be 40-feet long and is gonna be made of

sections of something known as box culvert.

They're precapped concrete

pieces that will be four-feet high and six-feet wide.

The first thing we have to do is

put those in here and join them together.

Yep, and if you

thought the small-scale rig was heavy duty--

That piece of culvert behind

me weighs 32,000 pounds.

Sixteen tons.

All together this is the largest

construction project we've ever undertaken for an experiment.

It is, and luckily the team of heavy-lifters are on hand

to choreograph the culverts into place.

I want to set it to music.

You guys are like ballet.

These things aren't just decorations.

We saw on our small scale experiment

that obstructions like this dramatically speed up the burn.

And so these may make the difference between manhole

covers that jump up a little bit or a lot.

They're standing in for real-life blockages like

sewer servicing equipment and garbage.

And based on the small scale,

they should accelerate the speed of the burn.

You may be wondering why we're going whole hog on this thing

rather than working incrementally up to it.

Why start with the best case scenario?

For two reasons.

We are spending a tremendous amount of time and energy

building a full-size, full-scale sewer,

And we don't know that maybe a mid-scale expl*si*n

would render it useless for further tests.

Given the number of unknowns,

I think it's safe to say that we only have one shot at this.

The other reason we're going full scale is because

when you scale things up from small scale to large scale,

things get complicated very quickly.

Given all of that

we want to see what happens to these manhole covers.

That's why we're going with the best case scenario.

Looking more like a real sewer every minute.

Have you gays cleaned up

It's a sewer down here.

It's the best case scenario,

but it's not an unrealistic one.

Looks pretty good.

Sewers are naturally confined spaces.

Add to that what we know

about the instances of standing water or pipe configuration,

and this closed system with blockages

is the most likely scenario for a blast.

With the sewer stretcher complete --

It's almost done.

It's time to make the earth move.

We're going to bury our sewer under three feet of dirt.

While the dirt is actually an important structural part of the sewer.

A sewer that's buried underground, it will be

a lot less likely to blow apart than one that's on the surface.

Indeed, because the only things

that are supposed to blow are these

And now what this whole thing's all about--

the manhole cover.

This is your basic cast iron manhole cover.



and 103 pounds.

If this indeed is going to we want become our projectile,

we want to make sure we see it.

We're going to make it a little more camera friendly.

The distinctive manhole covers are man handled into place.

You know why a manhole cover is round, don't you?

It's the only shape that won't fall through its own hole.

And now to prep the elements that will make their sewer expl*sive.

Believe it or not the methane in this tank is enough

to create a blast equivalent to 120 pounds of high expl*sives.

We're not going to put all of this in our sewer

we're only going to put 1/3 of it or 100 cubic feet in there.

But just to be safe,

we're going to bury this in a pit nearby,

and we're going to operate it remotely with the solenoid.

It's done, we're wired.



to the perfect stoichiometric ratio for a big boom.

We've optimized the design of our full-scale experiment

based on everything we've learned in small scale.

We are going for the fastest burn possible.

Now there is a small chance that we could achieve a detonation.

Let's lay some cable.

That means in order to be safe,

we have to remove all of our systems.

The gas release, the gas monitoring and ignition,

almost a quarter of a mile away.

With that, their spectacular sewer is ready for

what could be the most expl*sive debut ever on "Mythbusters"

They look beautiful

This sewer is a replica of a real-world sewer

except that we've optimized it to give it

the best possible chance at actually detonating a gas

instead of deflagrating or burning it.

If it just burns, it will be Fairly impressive,

and the manhole covers will probably go fairly high.

But if it detonates, they're really going to go high.

And here's the thing--

If it detonates, this will be the

first incident that has ever been recorded and documented

of a gas detonation occurring from a natural source

like a flame or a spark.

That will be something.

Coming up next on "Mythbusters"

Can bedliner make a coat bite-proof?

Do not try what you're about to see at home.

We're what you call experts.

Dogs, man's best friend,

loyal, cute, and cuddly.

Well, most of the time.

Sick 'em, boy.

Their bite may be worse than their bark.

But can truck bedliner protect you from the jaws of an angry dog?

Looks like it's working.

We're testing bedliner myths,

specifically that if you coat a jacket in bedliner,

you can make it dog bite-proof.

So far we have a rig that can bite down with 400 pounds of force.

The next step, using real arms and a real dog.

Dog, no problem.

Tory's going to provide the arm.

And German shepherd Cliff is going to provide the bite.

But before Tory get into his bedliner--

Okay, what do you think is the best way to go it this?

We'll start off with putting Tory in the full bite suit

and letting Cliff bite Tory.

So he can get the taste of Tory?

And so he get the taste of Cliff.

Does he like Italian?

He's never had any.

That's about to change, because for starters,

Tory must don the familiar dog bite suit.

And despite the fact he's been here before--

I'm not nervous, I'm scared.

nobody likes staring down a highly trained attack dog.

Look, Tory, he's salivating.

This isn't going to be good.

Hey you stop the fearsome dog, stop the fearsome dog, fight.

Good boy.

As expected, the heavy duty nylon of the bite suit

protects Tory from Cliff's bite.

But Cliff doesn't seem to know that.

He didn't let go that fast.

Apparently he likes the Italian.

Holy crap.

I'm nervous.

I didn't feel hurt.

Did you see how long it took him to get it off me?

Did anybody else feel bad about this, or is it just me?

Although the bench test may have proven the bedliner successful--

Doesn't look like there was any penetration

Robo chomp is a far cry from an angry attack dog.

Good dog. Good boy.

Look at him. He was really pissed.

Feel like you want to go again?

Not really, I don't.

I don't like.

All right. It's the moment of truth.

With the control complete,

it's time for Tory to make his bedliner debut.

That is the height of fashion, my man.

Thank you, friend.

Does it close up?

Well, the problem is--

I think I put on a little weight with these pants.

Bring out the dog.

Let's get this over with.

Grab the arm.

With Tory squeezed into the jacket,

it's the moment of truth.

This seems like the opposite of a good idea.

I hope this suit works.

Get that bedliner. Get the bedliner.

Okay, this is bedliner jacket.

Is it dog bite-proof or not?

Good boy.

It stopped it.

That was incredible.

Amazingly, it's just seconds before Cliff realizes

that he won't get his man.

The bedliner is too tough.

That was incredible.

It stopped the dog from biting through the jacket.

Oh, my god, I never want to get bit by one of those for real.

We've had dogs attack us wearing these suits.

But these are rated for dog attacks.

They're designed so that you don't get hurt.

However, this has never been rated,

so I have no idea whether or not the dog's teeth

were gonna tear through this or not.

It worked.

It stopped the dog attack.

We have a dog bite-proof suit.

I call this one confirmed.

Confirmed.

What's worse, the bark or the bite?

The bite.

Down at Ione, California,

the Mythbursters' great drain disaster is about to go off.

Here's how this is gonna work.

We will be activating this experiment from 1,000 feet away

in the safety of this steel bunker

behind b*llet-resistant glass.

When I click this switch--

It will open this valve and

allow the methane to flow--

Into our homemade sewer buried underground.

when the stoichiometry, or the mixture between gas and air

has reached the ideal relationship for an expl*si*n--

I'll hit this switch,

creating a spark which will ignite the gas.

Hopefully sending these three manhole covers flying sky high.

That's the theory.

That's the theory.

Because if the 103-pound manholes don't fly sky high,

the myth is busted.

What we need to see for this myth to be true

is pretty straightforward.

We need to see some type of shockwave or expl*si*n

that does not destroy the sewer

and yet launches the manhole covers.

I'm not talking like a--

I'm not even talking like a bump, bump,

I'm talking launches them.

Well, with the fire department on standby,

there's only one way to find out if those manholes will fly.

You ready? I'm going to start the flow of gas.

Let her rip.

It will take 100 cubic feet of methane

to get the sewer to the optimum expl*sive ratio.



About 2%.



It's that familiar "Mythbusters" waiting game.

That sewer's getting pretty full of methane.

Small scale proved that

the perfect stoichiometric ratio sent manholes flying.

However, will the full-scale equivalent,



Should we do it?

I think it's time.

All right. Call it.

All right.

Real world sewer expl*si*n, best case scenario,

sparking in three, two, one--

Look at that!

That had to be 100 feet.

That was insane!

That exceeded my wildest expectations.

That was significant.

Significant is right.

The manholes turned m*ssile, rocketing 150 feet

and only returning to earth after a hang time of six seconds.

Go take a look.

All right.

And closer inspection of their sewer

has the guys astonished at the force of the expl*si*n.

There's two.

There's three.

And-- the number one seems to have traveled the farthest.

That's one hell of a blast.

I think the whole roof of the sewer came up.

Well, as I'm walking on it, I can feel that feels soft.

Do you feel that?

That's what I'm saying, all this dirt

kind of came up in the air a foot or something.

We should check our high speed.

That was awesome.

Yep, and from the safety of solid ground,

the high speed shows that the deflagration of the sewer

sent earth and manholes flying.

There they go.

It's perfect.

They look like flying saucers taking off.

Look at number two showing it through from the camera.

That is insane.

That might be one of my favorite high-speed shots we've ever got.

That's gorgeous.

Gorgeous and also very revealing.

Seeing fire coming out of that manhole cover and not the others

is telling us that this is not a detonation.

If it was a detonation, it would all be simultaneous.

We're not seeing that,

so this is a burn.

Yep, but a burn big and fast enough

to bring the manhole mayhem to a close.

If there's one thing everyone knows

they're gonna expect from a sewer expl*si*n

is that number two is gonna fly to the air,

And that's what happened.

I'd say mission accomplished.

You know, it kind of makes you wonder,

could you get a jet to fire like that coming out of the toilet

when you're sitting on it if something like that happened?

Man, that was awesome.

We got a super-fast burn.

We got internal pressures in the sewer

of over 100 pounds per square inch,

and our manhole covers flew 150 feet in the air.

Yeah, and that wasn't even a detonation.

Can you imagine what would happen

if the flame front and the shockwave got lined up?

Everything happens at once,

and who knows how high they'd go.

Still, we have plenty of information

to fully call this myth.

Yep, confirmed.

Totally confirmed.

Sometimes the truth is far more

spectacular than fiction.

Next,

Kari, Tory and Grant have a blast.

I like our C4 remodeling.

But, can bedliner save Buster?

Final experiment for bedliner bedlam.

The b*mb.

If you coat your house in bedliner,

you can make it blastproof.

All right, here's what I'm thinking.

Four walls total.

Two cinder block walls,

one coated and one not,

and two standard wood frame walls,

one coated, one not.

Then we detonate expl*sive,

see how the myth stands.

All right, then we'll see how

strong this stuff really is.

Quick as a flash

they knocked up this four walls for a test.

So we have two sets of walls, wood ones

and cinderblock ones.

We gonna see how well the bedliner does

against an expl*si*n.

A lots of people ask me

do you ever get tired of blowing stuff up?

I tell them, no, I don't.

It will be a blast times four.

But that's not good news for Buster.

So we placed Buster right in the

middle of our wood-frame house.

He's got no instrumentation inside of him.

It's a visual test.

We want to see if the walls fall in on him.

Now on this side of the wall,

I'm setting up the blast.

C4 is exactly five feet from the center

of the wall.

And as it explodes

it's going to Put out a blast load of 95 psi.

We'll see how the wood wall handles it.

Okay, this is control test for bedliner.

Here we go.

Three, two, one.

Blew a hole in that wall.

It's Buster.

He's all blackened.

Thank you Buster.

Unsurprisingly, the code-compliant wooden wall

between Buster and the C4 failed.

Looks like we just put a new door in.

I like our C4 remodeling.

Now, if this bedliner has any hope of

working at all, what it's gotta do is contain most,

if not all of this and keep it

from hitting Buster.

My prediction--

I don't think So.

Well, to find out, it's

relocation-relocation, as Buster

is moved to an identical wooden home--

Good luck, Buster,

you gonna need it.

All except the coating of bedliner.

Now for the bedliner house.

Same amount of C4,

same distance.

All right. This is wood wall, wood bedliner

versus C4.

Do it.

In three, two, one!

And the smoke clears and--

it's still standing.

The wall is still together.

All right we've got to check the inside.

Let's go look. Let's go look!

It worked, baby!

It stopped the shockwave from breaking through the wall.

That's incredible.

This is a remarkably good shape.

It's blast-proof from the outside.

Let's check the inside.

I would have to say this is totally blast-proof.

Amazingly,

the coated wooden walls are indeed b*mb-proof,

but can bedliner hold the C4 wolf away

for the cinder blocks?

Now we're moving on to the cinder block wall

but we are gonna double the amount of C4.

The reason is because the amount that we used on wood walls

would not do any damage at all to the cinderblock wall.

All in all,

it's just another brick in the wall.

And in doing so we are also

increasing the amount of blast

load from 95 psi to 1,400 psi.

We're going to set off C4 in

front of both walls and see what happens.

So first to find

out what double the C4 does

to their cinderblock control --

In three, two, one--

Yeah.

I see a hole.

Yep.

Wow, it blew the whole back out.

It blow just like the wood wall

but it pushed all the bricks out of the mortar.

I would have to say

buster probably didn't survive this blast.

All right.Let's see what the bedliner does.

OK. That was pretty impressive.

For the ultimate test of bedliner,

buster has his back to the reinforced wall.

But will it be enough to protect

him from a C4 blast?

This is bedliner on a cinderblock wall

in three, two, one.

I see smoke rising, and--

Left a big, black mark,

but I don't think it did any damage to it.

I don't see a hole.

I don't see a hole.

From the front,

it's looking good for blast-proof bedliner.

Guys, it's looking really good from this side.

Yeah, there's hardly any damage.

It's just dirt.

Let's look at the other side.

Nice.

It worked!

Buster survived!

So bedliner is blast-proof.

Totally blast-proof.

This one's confirmed.

So as it turns out, bedliner

Has amazing blast-proofing qualities.

We sprayed to a wood wall here,

it kept the wall together and

kept it from showering Buster from debris.

Now here was our cinder block wall.

It totally devastated the

back of the wall, crumbled everything,

debris everywhere.

And here on our treated cinder block wall,

Not a scratch on it.

Bedliner is a blast-proofing agent confirmed.

That was incredible, man!

We've got a new application for bedliner?

That's awesome stuff.

What else can we do with it?

Let's see if we can make stuff bulletproof.

What about shark-proof?

What about bear-proof?

Want to know why we did what we did

and didn't do what we didn't do?