A man is in critical condition after he fell onto a propeller as he tried to move a boat that had run aground in the Florida Keys.

The incident happened Wednesday near Bud-n-Mary's Marina in Islamorada.

Passengers told officers with the Florida Fish and Wildlife Conservation Commission their vessel ran around on the flats near the marina. They were stuck for more than two hours before a boater stopped to help, but they soon got stuck on another flat.

Investigator Racquel Daniels said Robert Daigle, 37, of Fort Pierce, jumped in to push the boat off the flat, but he fell onto the propeller as he pushed from the stern with the motor running.

Daigle suffered cuts to his arm and shoulder.

He was flown to Jackson Memorial Hospital’s Ryder Trauma Center in Miami, where he had surgery.