The Orpheus' team of scientists are on a mission to find a renewable source of energy in the depths of the Arctic Ocean. The last team who went died in mysterious circumstances, so the Orpheus crew are already feeling nervous when a salvage inspector unexpectedly joins their mission.

Cast: Orla Brady, Nicholas Pinnock, Molly Jones, James Nesbitt, Sinéad Cusack, Shonagh Price, Goran Visnjic, Minnie Driver, Sacha Dhawan, Antonia Thomas, Vera Graziadei, Ron Donachie, Tobias Menzies, Nigel Whitmey, Dan Li