Captain Jack

There used to be a time when ships from Spanish and English towns were sailing the Caribbean sea bringing goods from a town to another. But they didn't always reach their target because the sea was also full of the most powerful and cruel pirates the world has ever seen. Above them all, there was the king of the pirates. Captain Jack.
Captain Jack was a tall and well formed man about 43 years old. Unlike the other pirates he had no scar from his battles. His frigate "La Signora" had only 30 men as crew, but they were enough, because they were the best sailors in the entire Caribbean. The crew loved their captain and he loved them. Captain Jack was a very special man. He didn't have that thirst for blood so common to the other pirates. When he was plundering a ship he killed all those who dared to oppose him and set free those who surrounded.
One day, after the capture of a Spanish treasure vessel he said to his crew:
"We had a good day, right mates?"
"Yes, captain."
"We have a lot of gold, right mates?"
"Yes, captain."
"Well, since our "signora" is a bit overloaded, what do you think we should do, mates?"
"Bury, bury, bury."
"Good idea."
"Captain" said Jack's right hand; "where shall we hide our treasure?"
"But off course my dear comrade, on our mother land, the island of San Juan."
Two months lasted the journey, but in the end they arrived. They landed the morning of 19 of May and found a spot in the heart of the island.
"Since it's thanks to you that we have this treasure, I will let you have the pleasure of hiding it."
He went to the beach in the meantime and didn't return before the work was done.
From that time, Jack was never the same. Every day he become more silent and more somber. The crew began to worry. Some of them belived that the ghosts of those he killed were hunting him, others thought he was possessed by demons.
One day they arrived at the island of San Juan to bury another treasure. This time however the captain said:
"Mates, the time has arrived to show you something of great importance."
He lead them to the beach and then to a cave they never knew about. They entered in the cave guided by their captain. They arrived in the center of the cave where there was a spot illuminated by the moon through a hole in the ceiling.
"Look."
Jack went in the light and changed. His skin become white, his face pale like a dead's man and his eyes red like blood.
"You see now comrades?"
"Captain, what happened to you?"
"What will also happen to you."
"Aaarrrhhh!!!"
Many years passed since then. Ships started to disappear without leaving a trace that they ever existed or that the people on them ever lived.