在一次创伤事故期间，在大西洋深处的深海潜水中，橄榄，一个有天赋的年轻海洋生物学家发现了一个神秘的生物。 松开她的梦想工作，橄榄偷运这个生物回家，打算在地下室学习它，不知道她专心的男友马特。 虽然努力重新调整内陆生活和恢复从她最近的创伤，橄榄开始意识到，她和这个生物共享一个共生的纽带，驱使她执行其险恶的意志。 受到可怕的噩梦的困扰，她在海上深处发生的事故的破碎记忆开始解开，并揭示了一个比她想象的更年长和恶毒的恐怖恐怖，她不知不觉地自由释放。 橄榄的迷恋导致疯狂，因为她的发现消耗了她的整个人性，对周围的人有致命的结果。

  During a traumatic accident whilst on a deep-sea dive in the depths of the Atlantic Ocean, Olive, a gifted, young marine-biologist discovers an unearthly creature. Loosing her dream job, Olive smuggles the creature home, intent on studying it in her basement, unbeknownst to her devoted boyfriend Matt. Whilst struggling to re-adjust to landlocked life and recover from her recent trauma, Olive begins to realize that she and the creature share a symbiotic bond that drives her to carry out its sinister will. Plagued by gruesome nightmares, her fractured memories of what happened during the accident in the depths of the ocean begin to unravel and reveal an eldritch horror far older and malevolent than she could ever imagine, one which she has unwittingly set free. Olive's obsession leads to madness as her discovery consumes her entire humanity, with deadly results for those around her.