Generic Question Thread

[Ragitsu]

As to broaden the parameters of the original thread I created, and not clutter the board with multiple topics in a short span of time, I created this thread.

So, here go my first few questions:

Given the likelyhood of the PCs having to swim through a tunnel, a waterproof backpack that can withstand water pressure up to about fifty to sixty feet sounds best. Could something like this exist? If not, what alternative do they have?

How much plastic explosive does it take to wreck the average industrial deadbolt lock? And, will this be sufficient enough to damage it to the point where one could simply open/kick open the door it is on? I'm trying to design "lock buster" charges for my PCs to have as part of their mission gear.