Exploring the harbor of San Juan in Puerto Rico and you notice an old man pottering around on a mysterious vessel. As you get nearer, he greets you and tells you about his homemade submarine. He built it, he says, to be able to hunt for sunken wrecks in this area. Sadly, he is now too old to take the submarine down himself. When he offers you the opportunity to take a dive you excitedlz agree. You listen ashe quickly explains how everything works, you get on board, and dive down.