Just keep swimming.
That's what dozens of surfers in Encinitas, Calif., unknowingly did as a Great White Shark reportedly swam among them.
A viewer sent San Diego's CBS 8 a photo of what appears to be a shark caught in a wave. He told the station he had been photographing the landscape at Swamis Beach and didn't realize what he had captured until he reviewed his pictures at home. (Scroll down to watch the interview.)
However, the photo one anchor calls "jaw-dropping" is raising a some questions from skeptics who say the "shark" could very well just be a surfer paddling through a wave, or the work of Photoshop.
"When [surfers] duck dive, they lift their leg up, and it looks very much like that," lifeguard Sgt. Robert Verla told CBS 8.
The news station sent the photo to a local shark research committee that believes the object in question is indeed 10-to-12-foot Great White.
If accurate, the sighting adds to a series of recent shark reports along San Diego's popular coastline. On Wednesday, a Great White was reported near La Jolla's Children's Pool, causing lifeguards to close a two-mile stretch of beaches, NBC San Diego reports. Sightings were also reported on Aug. 25 and Aug. 26.
Great White sightings aren't uncommon in the area, though. Some adolescent sharks, between 7 and 10 feet, can be spotted in Southern California from May and into the later summer, according to the Los Angeles Times.
A possible explanation for the August sightings? Waters didn't warm up until later in the season, marine biology professor Chris Lowe told the Times.