Yes! These little subs are great aren't they!
My wife and I took a trip on one in Cozemel Mexico during our honeymoon cruise. I was wondering to myself as we boarded, 'Are we really going to see anything?" Boy did we! Sharks, sea turtles, fish and coral of all types. It was better than I ever expected. Easily the best shore excusion of the whole cruise.
Only one caution- It
is tight in these things. Be warned if you are really claustrophobic. A woman started panicking and crying to get off when we were at around 90ft down. They got her calmed down, but we weren't sure what was going to happen there for a few minutes.