THE MISSION: Sink an unsinkable warsub. Truman McClusky, Mayor of Trieste City on the shallow continental shelf just off the coast of Florida, has given his team an impossible task: infiltrate an enemy warsub, blend in with a hostile crew, damage the vessel from within, and hope to hell they can escape before it takes them all down. The stakes are massive, for if they don't succeed, its next target will put an end to the peaceful colonization of the ocean floor once and for all: Trieste City itself.