There was an era when underwater photography was rare, unusual and novel.  I purchased a Calypso-phot camera in 1963 and on a memorable safari north with friends, asked Ron Taylor to take a single picture of me with a crayfish.  This was North West Island in July 1963.  When the film was processed I saw for the first time what I looked like as a diver, underwater.  No big deal today but back then it was a real thrill.