ST JOHNS COUNTY, Fla. -

A boater in cardiac arrest was rescued by crews Tuesday north of the Matanzas Inlet in St. Johns County, according to authorities.

At about 3:30 p.m., St. Johns County Fire Rescue responded to a report of three people out of a boat on a sandbar taking on water. Authorities said an ALS engine, two marine rescue units equipped with two personal water crafts, one rescue unit, and a battalion chief arrived on the scene and found a fishing boat about 16 feet long unmanned in the surf.

A second fishing boat was assisting two people in the water and one on the sandbar, authorities said.

Fire rescue crews said they launched a water craft and made contact with the second fishing boat. 

Authorities said they determined that one of the subjects was in cardiac arrest. That’s when a paramedic rescue-swimmer boarded the vessel and initiated CPR.

The patient was transported to the dock at Fort Matanzas, where they were met by advanced life support crews who waited for their arrival, authorities said.

Fire Rescue initiated advanced life support and transported the patient to Flagler Hospital in critical condition.

No other injuries were reported. Crews later secured and towed the boat.

Authorities said the Florida Fish and Wildlife Conservation Commission are currently investigating the incident.