The film revolve around two sisters Drew and May who go diving at a beautiful and remote place. One of the sisters is struck by a rock leaving her trapped 100nfeet below the sea level with dangerously low levels of oxygen and cold temperatures. The film starts with a scene where two sisters re-unite to take a sea dive trip in a remote and far area.Upon arriving,they assemble their diving kits and both jump under the water to explore the caves and aquatic life under the water.Unfortunately,May escapes falling rocks from landslide taht saw her sister Drew stuck under the sea bed.In their fight for survival,the two sisters revisit their childhood background with May having to face the trauma of drownning from her father.Her father is shown through several flashbacks trying to drown her during family diving.