In the cold, dark waters off North Korea a U.S. Navy fast attack submarine meets with a mysterious disaster - it's attacked and nearly sunk by an ominous stealth submarine resulting in the deaths of the Executive Officer and the Engineering Officer.
| Actor | Role |
|---|---|
 Adrian PaulFrank Habley | Frank Habley |
 Catherine DentClaire Trifoli | Claire Trifoli |
 Kent McCordSommerville | Sommerville |
 Mike DoyleTom E. Palatonio | Tom E. Palatonio |
 Matt BattagliaDizzy Malone | Dizzy Malone |
 Mark DeklinCaptain Galasso | Captain Galasso |
| EEitan KramerPetty Officer Buckley | Petty Officer Buckley |
 Eyal PodellPetty Officer Murray | Petty Officer Murray |
 Todd BabcockNSA Agent Winters | NSA Agent Winters |
| LLarry WeggerRear Admiral Merritt | Rear Admiral Merritt |
| GGene DeFrancisPetty Officer Savage | Petty Officer Savage |
 Eileen GrubbaRebecca Malone | Rebecca Malone |
 Mathew St. PatrickSteven Barker | Steven Barker |
| SSteve BoatrightWeapons Officer | Weapons Officer |
 Mark SandersonCorey Roperto | Corey Roperto |
| SStephen ScibettaOfficer in Charge | Officer in Charge |
| RRoy TjioeMedical Officer | Medical Officer |