Accidentally set computer to 100% oxygen gas mix, so it freaked out 20 min into the and I stuffed it down my wetsuit to smother the sound. No good place to tie flag on Sheraton side so I had it with me and lost it at one point; Shawn retrieved and carried it with him, getting entangled a couple times in the fins. Camera a misery. Finally found the correct P setting which helped (center focus) and set flash to M, but still very finicky. A bit surgey. Turned around relatively early. Then attempted to dive back side, but usual beach entry was completely missing all its beach! Farther along there was sand, but waves uncomfortably high for shore scuba entry esp with big cameras.