Police film 15 sharks near paddle-boarders
A police helicopter moved in to warn the group who had unwittingly ended up surrounded by great whites.
Footage of the close encounter, which was posted by the Orange County Sheriff's Department, shows how near the oblivious paddle-boarders were to becoming a shark's dinner.
"You are paddle-boarding next to approximately 15 great white sharks," Deputy Brian Stockbridge shouted over the loudspeaker. "They are advising you exit the water in a calm manner."
The Southern California coast is a particularly bad place for sharks, especially at this time of year.
Only last month, a woman was badly wounded after being bitten off San Onofre State Beach. Another woman was also bitten by a 10ft shark last year while swimming off Corona del Mar.
Fortunately in this case though the paddle-boarders all made it safely back to dry land.