The Prince and Princess of Wales reportedly thought one of their more adventurous hobbies would "freak out" George, but the ...

I was scuba diving ... aquarium with humans swimming around instead of sea life. The pool also has underwater cameras that showcase the action to spectators who aren't diving.

According to Scuba Diving Magazine, rather than relying only on chlorine for pool cleanliness, the facility utilizes a system that filters and circulates the entire pool every six hours.