Poseidon Rex Description:

To pay off a debt owed to Belize crime lord Tariq, Jackson Slate goes with several gangsters on a dive to the bottom of the Blue Hole in search of rumored Mayan gold in the wreck of the Cortez. Using explosive charges on the sea floor, the men inadvertently unearth a prehistoric sea creature that attacks the dive crew killing all and leavings Jacks floating unconscious.