To crack a safe: why would you want to blow up a safe from the inside?

Dynamite

Source: Bob Eastman/iStock

On screen chemistry with Jonathan Hare

In the film, The score, Robert de Niro plays a master safe cracker who's talked into doing one last job before he retires - he has to steal a gold statue stored in a safe in a high security building. He manages to fool the security and get to the safe. However, instead of blowing the door off with dynamite, he drills a hole into the top of the safe and, tapping into the room's sprinkler system, fills the safe with water. He then places a test tube of explosive through the hole into the safe and blows it up from the inside out. So is there anything to be gained by doing this or is it just a bit of Hollywood science? 

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