There is no question that the sea holds mysteries and inhabitants beyond our imagination, that we are yet to encounter.
But a Scottish tourist was left in shock after unwittingly capturing the image of a bizarre sea creature in his holiday snaps.
Harvey Robertson, 52, was on a boat cruise with his family in Corfu when he took a number of photographs inside a sea cave.
He held the camera over the side of the boat to take pictures of the sea.
But when he lifted his camera back up, Robertson later realised a mysterious creature had appeared in one of the frames.
Robertson said: ‘I have no idea what it could have been, I have never seen anything like it.
‘I caught the picture by accident. I was in a sea cave on a small boat about 20 miles south of Albania on the west coast of Greece.
‘I was trying to capture the water colour and was not looking at the water, the flash went off. I only saw the creature when looking back through my pics.’
‘The creature, that has so far been unable to be identified by experts, evokes images of Greek mythology.’