What is she holding in her left hand?
Found out it is from a youtube video as well and it has a different angle.
Aww ye, ged it gurl
...AAAAND HE'S OUTTA THERE
Well yeah I would assume it was achieved through sudden pressure loss, or allowing it to implode from a sustained low pressure.
I meant as in that's how they achieved the effect. I am not saying it's a real tank.