I don't have any experience with this particular container, but it looks pretty good. I doubt, however, that it woudl work for any length of time in a scuba environment. In our local environment, urchin spines would perforate it in a heartbeat. I have a lot of scars from spines that have penetrated a 3/8" wetsuit and gloves.

Actually, when diving, you are already set for survival because you have your big, bad knife, right? (and probably a light as well). My perennial fear when diving was of surfacing and finding no boat in sight, and having to swim about two miles to the beach. I thought I would carry a metal match or similar and a signal mirror. Most beaches have enough debris on them to equip a sporting goods store. Seriously, I have found functioning dive lights and edible food on beaches where I dive, as well as a rich supply for improvising almost anything I could desire.