The Department of Natural Resources is continuing its search for a missing 23-year-old Florida man last seen Saturday evening.

Kevin Theodore Husum, of Panama City, Fla., fell off of a pontoon boat near Three Sisters Island and did not resurface, according to witnesses.

“We are still searching, but he has not been located yet,” DNR public affairs officer Mark McKinnon wrote in an email.

The search area is large and is in depths between 40 and 80 feet, according to authorities.

“No decision has been made to scale back, so we will continue searching each day with side scan sonar as we are now,” McKinnon wrote.