2 hours and 20 minutes of bottom time.
We actually finished our tasks early so my buddy and I got to spend some time looking for shark's teeth in the gravel and showing off for the guests.
There's a ledge with three windows so the guests can see the Nurse sharks hanging out under the ledge. The Gray Nurses (AKA "Sandtigers" and "Ragged Tooth Sharks" -- different from the Nurse sharks) also like swimming under the ledge as well, so the guests get to see how big they are because they're so close.
If I've got some free time I go under the ledge and move the sand around to cover up the bare spots (to disguise the concrete bottom the exhibit).
Typically the Gray Nurses alter their swimming pattern to avoid a diver under the ledge -- they cut back out to open water before they get too close. Well on one pass our big Gray Nurse, about 8' long and over 200 pounds was just about to swing out because I was in the way, but the other Gray Nurse, about 7' long, was on her outside keeping her from turning out to open water.
So I got to get one of the closest looks at our big girl I have ever gotten, her right pectoral fin just barely rubbing down my right side. This happened right below one of the floor windows, and I understand that it caused a lot of excitement among the folks that got to see it from right above!
Gawd, I love sharks, the closer the better!
What a change from the 70s when I used to dive Saipan and we'd be scared spitless if we ever saw one while diving!
Roak