Diving into the Unknown (original title Takaisin pintaan) is a 2016 Finnish film directed by Juan Reina.

Four Finnish cave divers face their worst nightmare when two of their friends drown deep inside an underwater cave in Norway. When the official recovery operation is called off by the Norwegian and British authorities after being deemed too risky, the friends set out on a secret mission to retrieve the bodies themselves.

The film premiered at the 2016 Docpoint Helsinki on 27 January 2016 and had its international premiere in Visions du Réel film festival, Switzerland in April 2016.