The Last Woman on Earth (1960) - Betsy Jones-Moreland, Antony Carbone, Robert Towne (Full Movie)

Storyline

Ev, along with her husband, Harold, and their lawyer friend Martin, are skinny-dipping while on vacation in Puerto Rico. When they resurface, they gradually conclude that an unexplained, temporary interruption of oxygen has killed everyone on the island... maybe even the world!