Ruined Temple of the Shark Priests

Publisher's blurb:

Deep under the ocean waits the ruined temple of the shark priests. At its entrance is a statue of a shark, surrounded by robed figures holding bowls for offerings. There are chambers where priests and acolytes once lived, and scattered bones further in the temple.
Coral and seaweed grow on the sandy ground and from the stone walls. At the heart of the underwater temple waits a deep chasm, descending into darkness. Hanging above it are metal cages, while nearby rooms are filled with sarcophagi. Another room has four shackles where something once was held prisoner, but no longer…