I was working on a compressed air energy storage system for a marine application many moons ago. It was a rubber bladder reinforce and shap-constrained external

I was working on a compressed air energy storage system for a marine application many moons ago. It was a rubber bladder reinforce and shap-constrained externally by Nylon fabric that would assume the load under tension. I can't recall the operating pressure, but what's vividly burned into my memory was the large fear the fabrication shop had of testing the setup (that if a unit ruptured, it would send large/micro projectiles hurtling through the walls of the facility). The solution was to test under water. We never ended up building the design, but storage under water is plausible safety mitigation I think, though that seems a bit unwieldy.