|The gameplay in Treasures of the Deep focuses on underwater exploration in a variety of wetsuits and gradually more powerful one-man submarines, in order to fulfill objectives such as capping underwater oil leaks, exploring shipwrecks, and recovering plane crash victims. Finding treasure is also a useful secondary objective - ancient gems from a sunken ship can be put towards upgrading your weapons, equipment, and subs.|
The game takes place over 14 diverse underwater locations, ranging from the Bermuda Triangle to Antarctica. The levels are designed to evoke a claustrophobic and moody environment. The game's soundtrack was composed by award winning video game composer Tommy Tallarico. There is one unlockable 'bonus' level, Atlantis. A player can occasionally unlock another bonus level called 'Shark Attack', where they play as a shark, with the objective of eating as many sea creatures or divers as possible.