Scuba divers held signs with red hearts and the words "love", while a couple kissed under water in the sea off Alonissos island in the Aegean sea.
They also spelled out a message with their placards reading, "Alonissos I love you deeply."
The event was organized by the municipality of Alonissos for Valentines Day, and to promote the start of underwater weddings being offered on the island.