As Labor Day weekend begins, many will be planning family trips to the beach.
Although, for those in San Diego, this picture might make them think twice.
A terrifying photograph shows the moment a Great White shark was spotted in a wave in Encinitas, California - just a few feet away from completely oblivious surfers.
Gary Elliott, a passer-by who took the picture on Wednesday was convinced he had seen a shark - and the claim has now been backed up by marine experts.
'It looks pretty clear to me,' Mr Elliott told CBS8. 'It doesn't look like a surfer. It's not the silhouette of a board.'
The claim was initially disregarded by lifeguards at the beach.
Robert Veria said the photograph had, in fact, captured the moment a surfer duck dived into the wave with his or her knees bent.
But marine experts have since confirmed that the picture is most likely to be of a shark.
Ralph Collier, from the Shark Research Committee, told CBS8: 'In my opinion, we are looking at the tail end of an animal that is... 10 to 12 feet, maybe a little more.
Officials said despite the sighting the beach would remain open for the weekend.
The stunning image was taken as two-mile stretch of coastline in La Jolla was reopened yesterday despite three confirmed sightings in a week along the San Diego coast.