You’re being sent down in a submarine, on a mission to explore a cavern that’s opened up in the ocean floor. You’re an apprentice to a captain, and you two are here before any authorities arrive to the scene. The captain has stayed on the ship above, and you’re in the sub.. as you’re being lowered, the sub shakes violently as something hits it in the side. Before you know it, you’re free falling and disconnected from the chains.. something’s attacking the sub.