A covert operative, Wheeler, finds himself in a dire situation when he awakens in a high-security military submarine converted into an off-the-books CIA black site. Stripped of his rank and status, Wheeler must navigate this imposing underwater fortress while piecing together why he was captured and who betrayed him. His situation becomes even more precarious as he realizes that multiple factions within the submarine have their agendas, clouding his path to freedom.

Wheeler garners the unlikely alliance of a fellow prisoner, Marco, a dangerous and highly skilled fellow operative, to help him fight their way out. As tensions mount inside the vessel, the duo engages in intense battles and tactical maneuvers to survive. Wheeler must outsmart the various enemies, including his former colleagues turned adversaries, to uncover the truth about the operation that landed him in this perilous situation and reclaim his freedom.