I'm Hollywooding it here, but I bet it develops crack lines before collapsing. Most things in nature fail slowly, then all at once - think of standing on an iced-over puddle or pulling tree limbs.
Failure is going to occur on the order of fractions of a second at those huge pressures. (Fortunately?)
Here's a pressure vessel failing at only 1 bar:
Perhaps there might be a hairline crack that makes a window shatter when it's hit with a hammer. Except the hammer impact is constant. I don't think there would have been a lot of time.
Press against a solid object gently with one hand on each side, then suddenly yank away one hand. The object will be accelerated gently. Now do that with all your strength and send the object flying through the room in no time, with a few dozen kg of pressure. Now imagine that you could apply hundreds of tons of pressure. In such a system, every change will be nigh instantaneous.