The Deep (2015) (2015)

S1E12 The Phantom Sub

Title: The Specter Submarine Plot: Is there truly a phantom submarine lurking beneath the waves? Ant is convinced of its existence, but when he stumbles upon this so-called "specter sub," the reality proves to be far more bizarre and perilous. Ant and Fontaine soon discover they are ensnared—not just by a ghost, but by an unforeseen threat lurking in the depths.