Solitude of the Deep Dark

During a dive to repair a submersible mining robot, Rohan, a deep-sea specialist, discovers the true cause of the machine's malfunction: the metallic nodules it was harvesting are alive, ancient, and lying in wait. Too late, Rohan realizes that they can hijack his mind and body. Trapped within himself, he helplessly watches as the entities twist his friend into a weapon for their own spread.