Wonder if a certain deep water submersible company watched what happens to a sealed tube under pressure before doing their thing

I'd call that plausible, not busted, Transport companies have been in all kinds of trouble for neglecting to maintain or properly repair things.

Jamie's welds were excellent to able to hold 11 inches of negative pressure.

I LOVE that the cameraman jolts every time.

25:15 "You have no idea how hot it is in here?"
Camera man: you're telling me

After filming, I hope they send the car to the scrapper with no explanation of what happened to it.

You can tell at the end it went from "will this work" to "well we can't film the episode if we don't get it to implode"

16:03 the person looking from the second floor window to see if they have not died😂😂

This experiment has been accidentally duplicated during the construction of the Czech nuclear power station in Temelin. There was a huge stainless-steel tank (half a million litre, if I remember well) for cooling water to be pressure tested. They filled it water for that purpose and performed the test. It passed with flying colors, and they started to pump the water out - not letting any air in to replace the water. The tank has done exactly what the one in the Mythbusters' movie...

This is where television peaked

What makes it even more realistic that something like this would happen, is that since these are primarily just for liquid transport, I doubt the company would care about even a fairly big dent.
They'd inspect it to make sure the internal damage wasn't too severe, check if it was airtight and then just continue transporting fuel or whatever with it, instead of wasting money on an extremely expensive bit of kit for what is effectively cosmetic damage.

42:20 most cooperative prop in the entirety of MythBusters.

We did a similar demo at school. But with a little more flair. Can had some water in it, put on a Bunsen burner. Then picked up with tongs, and dumped upside down into cold water. Immediately crushed.

It's always stuck with me, such a clever demo

'Inches of mercury' has to be the most ridiculous name for a unit anyone has ever come up with.

8:36 Adam's laughs after each time the steel drum makes a "bonk" sound are so cute. Like a kid living his best life

I remember decades ago when the brilliant Professor Julius Sumner Miller tried doing the experiment with a 60lt (12) gall drum and it failed, later on a show he tried again and had given up and was walking back around the desk when the drum imploded.
He got quite a shock, however the camera operator had maintained his view of it instead of following the Professor and caught it occurring. This occurred here in Australia on the ABC TV channel.

9:41 You know it's a good one when you get a laugh from Hyneman 😂

This is perhaps the most impressive display of force the Mythbusters ever conjured, and I use the word "impressive" deliberately. Every explosion they ever made was "spectacular", but pretty much everyone knew what was going to happen. This is different. There was no explosives, no 200T descending weight, no nitro-powered ramming truck... just physics and geometry. And what they were left with was a piece of modern art dedicated to science.

I love that this took up the entire episode. It's like a documentary with more theatrics and serious suspense.

Okay, so the actual science behind how these crumplings occur is actually facinating.
So basically, how much outside force it takes to crumple one of these things depends on the material, wall thickness, vessel geometry, etc. And what is even more interesting is that the number of "waves" as it crumples (3 in the case of the barrel) influences the equation. So you need to plot the crumple pressure function for every whole number and take the smallest value. And whatever value is the smallest, is how many waves it will crumple into. The barrel crumpled into 3, and into 2 with the train car.