I've only been scuba diving a few times, and perhaps a pot brownie/edible would be more appropriate?
There's just too much vulnerability being that deep in the water. I remember seeing a LOT of sea urchins and getting freaked out because I know some times actually shoot their spikes off as a defense mechanism if you get too close and also one time I rubbed my leg on some fire coral on accident and had a nasty rash for a day or two. not to mention how scary sharks would be while tripping.
Also, there's the potential nausea of being on a boat beforehand, then when you get deep into the water where there's not as much light it can get REALLY cold.
Kudos to anyone who has had a psychedelic scuba diving experience, but its definitely not for me.
ALSO, this is hardly a risk but apparently some divers when they get to deep enough waters some of the compressed air in their tank starts to turn into Nitrous Oxide.
THAT could be VERY dangerous on a psyche.