T-O: Triángulo de oro - 'La isla fantasma' (1985)

The disappearance of a girl in high seas and the tragic death of her father make part of a puzzle that points to an island with a valuable solid golden triangle. The relatives of the victims and an unscrupulous group of mercenaries was embarking on a greedy search for triangle of gold in the middle of an island that no one has come alive. What do not know is that the island has deadly dangers that nobody has imagined.