After enduring eight wrongful years in prison for crimes committed by her deceitful sister Jasmine, former deep-sea salvage expert Elena Cole finally secures her release. Instead of welcoming her home, her biased parents and resentful ex-husband push her back into dangerous underwater operations. Cruelly scheming to silence her forever, they force her to dive using deliberately compromised breathing gear. Plunging into the dark, freezing ocean depths with failing equipment, Elena relies on her veteran survival instincts. Rather than succumbing to the watery trap, she fights through oxygen deprivation to surface alive and bring her betrayers to justice.