【電影觀看小貼士】： [DVD：標準清晰版] [BD：高清無水印] [HD：高清版] [TS：搶先非清晰版] - 其中，BD和HD版本不太適合網速過慢的用戶觀看
- A team of Finnish divers suffers a devastating loss when two of their friends don't make it back to the surface on a deep dive in an underwater cave in Norway. After unsuccessful attempts are made by international authorities to retrieve the bodies, the cave is closed off. The fallen colleagues are left buried in dark waters. In an act of camaraderie and compassion, the team reassembles in a covert operation to bring back the bodies of their fellow divers, risking their own lives in a secret dive. The team constructs a plan that becomes a pulse-pounding plunge into claustrophobic darkness, gambling with their own safety to honour those who stood and swam by their side.