Dangerous when alert

I slept well. I got to bed early and got up an a not-unreasonable time. I found that breakfast is much better if you go early: fried plantains, waffles, plums. Usually I’ve just been going to the omelette station, but I’m sick of those now. Toast! Could be better jams.
With my new powers of alertness I went scuba diving: 55 feet maximum depth for 35 minutes at a place called “The Arches”. It was nice and I was able to take some pictures with my cheap underwater camera. No idea how they will turn out though. The cool part was going under the arches, some of them fairly wide. Almost spelunking in a way. I was actually surprised there wasn’t more air stuck to the ceilings. How does it get out considering how many divers have gone through? Is the rock porous? Do fish steal it? Does the ocean absorb it?