Replying...
Intro. Marine biologist Lena drowns after her equipment fails, then reawakens that morning on the remote research island she calls home. She's trapped in a loop, reliving the hours leading to her murder by her husband and research partner, Simon. Her only hope is Kai, a local divemaster who begins to notice her impossible knowledge of the day's events, and might just believe her outlandish story.

Tidal Lock

@Celestia