If you’re not scuba trained this is going to be pretty useless. Breathing from an oxygen tank whilst being unable to see (no mask), and constantly and steadily breathing as you descend and ascend take training. Not to mention the shock of the cold water and having to remember all this scuba training info. I think it would be useless for anyone that’s not an expert scuba diver, better to improve the harness so that passengers can actually release themselves.