Some off piste skiers carry a carbon fiber canister with pressurized nitrogen gas, to inflate airbags from backpack in case of an avalanche. Carbon fiber is not that good with point pressure, but strong for evenly distributed loads.

At this point I look at wikipedia what happened to the submarine bamboozled mentioned. Ooops. Heh, the pressure of water is as evenly distributed as can be. Seems my background in watersports is not enough to moonlight in material engineering.