This very much looks like Grand Cayman, Sunset House !

http://www.sunsethouse.com/map_sunset.php

The notch directly in the left front of the pool.
With the camera person on the rocks on the left.

Very much a divers hotel just outside the main town & tourist area.

I dove there when the ladder was removable & the bottom was not attached. The waves were even bigger, going over the rocks when we got out.

Take your fins of in the water after you hug the ladder.
We actually sat on the ocean floor, took fins off, then timed it right to catch the ladder.