Episode 4
Arman and Yonca must swim out to fix a rupture, but the submarine is still in jeopardy. The Yakamoz crew discovers an intruder.
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More from this season
S1 E1
Episode 1
Arman reluctantly embarks on a submarine research trip sponsored by his father. At the Incirlik Air Base, Hatice reports an unusual radiometer reading.
S1 E2
Episode 2
Amid a search for survivors in Kos, Arman and Defne rush to find Kenan before sunrise. Felix and Cem scramble to restore electric power to the town.
S1 E3
Episode 3
Inside the submarine, tensions come to a head between Arman and Umut. When Barış's actions unravel, Erenay confronts an impossible dilemma.
S1 E5
Episode 5
After Hatice reveals a shocking truth about Erenay, Umut and Yonce begin to suspect Defne. The crew tracks an airplane. Cem makes a devastating choice.