After noting Jamison's presence, Sangster tails him with the aid of his unsuspecting skipper, Pepe Gallardo, dumping Steinhauer's body overboard on the way.

Arriving at Tiburón, Jamison begins to investigate the island's environs and its fauna, and unexpectedly encounters a group of mermaids residing in the coastal waters.

After showing them that he means no harm, one of the mermaids leads him to an underwater grotto, their hideout, which is filled with numerous giant clams, the source of Steinhauer's pearl.

Before long, Sangster arrives at Tiburón, and disregarding Pepe's protests, begins to throw lit dynamite sticks into the water in order to take Jamison out.

As he chases after them, Sangster's oxygen supply runs out, and stuck inside the fissure, he is left trapped mere inches from the water's surface and drowns.