When a U.S. submarine is hit by a phantom assailant in North Korean waters, the sub's captain (Adrian Paul) faces a court-martial to account for the unforeseen loss -- but just before his testimony, he's appointed to a top secret mission. Doing his best to ace the assignment while steering the ship past an unseen enemy, he must prevent his executive officer (Mathew St. Patrick) from taking the reins in a display of mutiny.