Los Naúfragos II: Los Piratas 1986 on netflix

The Cast Aways saga continues as the shipwrecked islanders discover a cave full of buried treasures, along with the bones of Pirates. They use the cave as a shelter and plan an escape with the loot. Before their plan is complete, a ship arrives with pirates, lead by a young woman, who have come to claim their treasure as their own, and a battle ensues between them and the shipwrecked islanders.The islanders discover by chance that the new arrivals have no claim to the treasure, and their leader a treasure hunting imposter.