CALUMET – Authorities are still looking for three people who remain missing today after embarking on a fishing excursion on Lake Superior Saturday.

“An extensive search of the waterway is being conducted via land, marine and air,” according to a Sunday release by the Michigan State Police.

Cmdr. Carolyn Moberley of the U.S. Coast Guard told the Associated Press on Sunday evening that the search would go on overnight. There was still no sign of the boat on Monday.

State police on Monday released the names of the missing boaters: 61-year-old Keith Karvonen, of Atlantic Mine, and Ishpeming’s 43-year-old Steven Chartre and his 9-year-old son, Ethan.

State police Sgt. Jamie Patterson says the lake may have been a bit choppy Saturday, but the weather was “pretty decent,” AP reported today.

According to MSP Calumet Post, the Atlantic Mine man launched a 16-foot craft from Portage Entry in Chassell early Saturday afternoon in order to fish for lake trout with the Ishpeming man and his son. When the trio did not return that evening for a fish fry, the Atlantic Mine’s man’s family began to worry and called police.

The call triggered other area law enforcement to join the search effort.

In addition to the Canadian Coast Guard, United States Coast Guard stations Portage, Sault Ste. Marie, Traverse City; Department of Natural Resources Law Enforcement; Keweenaw Bay Indian Community Tribal Police Department; Baraga Village Police Department; Houghton City Police Department; Superior Search and Rescue; and Houghton and Baraga county sheriff’s offices are helping state troopers search for the missing trio.

Troopers ask anyone with information to contact the Calumet Post at (906) 337-2211.

The Associated Press contributed to this report.