Santa Barbara S01E78 - Episode 78

Lionel finally admits to Augusta that he had an affair with Sophia and that he was with her on the night she fell overboard. Joe is trapped with Kelly and Dominic. Santana and Brandon pass out because of a gas leak, and Mason rescues them. Eden threatens to blow Cruz's cover if he doesn't use his connections to help find Kelly. Kelly and Joe get married unofficially where they're trapped.

Dominic is revealed to be Sophia!