Exploring the harbor of San Juan you notice an old man puttering around on a mysterious vessel. As you approach for a better look, he greets you and tells you about his homemade submarine. He built it and sadly, he is now too old to take the submarine down himself. When he offers you the opportunity to take a dive you excitedly agree. You listen as he quickly explains how everything works, you get on board, and start the journey. Very soon after diving below the surface, something goes wrong: the submarine breaks down and you sink, out of control to the seabed.
What will you do to survive?