Prima visione in Italia su Sky Atlantic.
Prima visione assoluta su BBC One (Regno Unito).
Trama
Mente il Vigil e' totalmente fuori da ogni comunicazione, da terra Kirsten cerca disperatamente di capire l'origine della minaccia che incombe sul sottomarino.
Trama Internazionale
Vigil is forced into lockdown as disaster strikes. With hostile boats tracking the submarine and communications down, Vigil's crew have to navigate this crisis alone. Kirsten desperately hunts for clues to reveal the source of the threat to Vigil, but with no word from the boat, she fears for Amy's safety. Amy's quest to uncover the truth places her in grave danger.
C.S.