i had my underwater housing smashed the other day during transit on a flight. it was in a 1600 pelican case.( without its dome, its got the same depth as a zd-approx, with its lens).
it was sitting in the middle of the case, and had about 1 1/2-2 inches of foam either side of it.
im amazed how it could be smashed, as i can stand ontop of the case and it only distorts a little.
i figure its had a heavy box fall ontop of it right in the center of the case. i still find it hard to belive, as the housing is very strong.
paul