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*wtf
Thats acutally a quite logical phenomenon: Pressure effects get worse as your sizes increase.
Thats the reason bicycle-tyres have higher pressure then the ones of cars...
What they did is heating up the air inside the car, and then closing it. This can be easily done by just burning a big blowtorch inside until all the air has been replaced by hot combustion gases.
If they get the temperature to 300C (not that hard), and close it, after cooling their will be a pressure of 5 tons per m^2. Which is a lot. For a vacuum tank this size, i would use walls of solid steel, at lest 2cm thick.
Edit: should have read the description of the original movie: The reason for the pressure differential here was just by the emptying: per meter of "falling height" of the liquid (might be a lot when filling an underground tank), there is one ton/m^2 pressure on the walls of the tank. Different reasom, same effect.