Sophie Lowe and Louisa Krause star in this thriller directed by Maximilian Erlenwein. Sisters May (Krause) and Drew (Lowe) may have drifted apart but they continue to meet once a year to dive and this time, they choose a beautiful but remote location in Malta. However, their underwater adventure turns into a nightmare when Mays leg is pinned by falling rocks and shes trapped beneath the surface with only 22 minutes of air left. Can Drew save her sister before their oxygen runs out?