The big bathtub

Last summer, when L & E & I went snorkeling at worn-down-by-tourists Hanauama Bay, I had some claustrophobia and quit after the first few minutes in the water. I hadn't had any problem in the past. I'm not notably claustrophobic, but I have always had a fear of suffocation. Suffocation-in-drowning, especially. Well, I got pushed into a pool before I could swim.
( Submersion )