 The game manual identifies the player character as Jack Runyan, a retired Navy SEAL and Gulf War veteran, now under hire of the Undersea Mercenary Agency (UMA), operating in an undersea base near the island of Vieques.Earliest mission comprends raids on sunken Spanish galleon Concepcion in Puerto Rico trench, nazist gold lost among Ionian Sea, aztec treasures in underwater tombs near Yucatan Peninsula, and Hormuz Strait break raid.During the game, the player is involved fighting Simon Black, the head of Seismic Corp, an organization that has been conducting illicit activities.