On a remote North Sea oil rig, Dr. Christine Hansen tests a groundbreaking cleaning fluid with Jacob Rasmussen and his rugged crew. When a worker vanishes, tension spikes then activist Mickey Hennessey storms the rig and takes hostages. But soon both sides face a greater threat: a brutal new life-form breeding in the rig's depths. Oil workers and environmentalists must unite in a desperate, evolutionary fight for survival against something ravenous.