Video: The tanker in the video is 20m long with a 3m diameter and can hold up to 113,562L of liquid. It's made of thick steel and weighs 30,391kg and yet it can be crushed with just the sweet simple science of air pressure. Watch as the gang at Mythbusters made the giant tanker implode in glorious slow motion. It just gets obliterated like it's barely a Coke can. All that's really needed to destroy the tanker is a difference in pressure. Get it hot enough inside the tanker and then let it cool and boom, collapse.
And here's a bit of the science behind the implosion too: