A businessman, his wife and their lawyer are diving in the sea, but when they surface they find everyone on the island is dead due to a sudden and short lived shortage of oxygen. As they come to terms with the possibility of being the only people alive, they also have to come to terms with there being only one woman and two men with the innevitable relational and sexual tensions and problems. This is an early film from director / producer Roger Corman. Betsy Jones-Moreland is the central character and gets through a wonderful selection of outfits.
2/5 
Betsy Jones-Moreland