The helicopter lay upside down in Biscayne Bay, fully submerged, with only its yellow floats showing above the water. Moments earlier, the small Robinson R44 had been in the air above the bay near Key Biscayne, filming boats below.

The chartered aircraft crashed near Bill Baggs Cape Florida State Park just after 11 a.m. on Wednesday, according to the Federal Aviation Administration. Of the three men on board, one was killed and two were seriously injured.

According to the Miami-Dade Sheriff’s Office, someone on a nearby boat tried to revive the unresponsive man with CPR before first responders arrived and took over.

“Unfortunately, even through all the life-saving efforts, the individual was pronounced deceased on the scene,” Miami-Dade County Sheriff Rosie Cordero-Stutz told reporters Wednesday afternoon. “This is a very tragic event.”

The two survivors were brought to No Name Harbor in Key Biscayne, where a rescue helicopter airlifted them to Jackson Memorial Hospital’s Ryder Trauma Center. Investigators said both men suffered critical injuries but are in stable condition.

Flight-tracking data from FlightAware shows the helicopter took off from North Perry Airport in Pembroke Pines and went down in the bay a short time later.

“The helicopter apparently is a chartered helicopter and was in the process of filming boats on the water,” Cordero-Stutz said. “Our hearts go out to the people affected by this tragedy.”

As of Thursday morning, the sheriff’s office had not released the names of anyone on board, saying families were still being notified. The National Transportation Safety Board is leading the investigation, with the FAA assisting.