Fremont County Search and Rescue crews located the two missing fishermen who died at Henrys Lake Monday night.

The bodies were located around 5:30 p.m., reported FCSAR Commander Brett Mackert.

He reported that his teams relied on a “side-scan sonar” or a fish finder to locate the bodies. The two fishermen used the finder to mark the sport of where they were just prior to their deaths. Rescuers relied on that information to locate the men at the bottom of the lake that’s 4 ½ miles across, Mackert said.

“We did have a point that was in their fish finder off their boat that we used,” he said. “It was not very far from where the bodies ended up being. After we got enough confirmation, it was worth putting the diver in a risky situation, and we decided to go ahead and dive. That’s how it all came about.”

Mackert reported the first man was found around dark on Monday while the other was located about 30 minutes later.

The names of the men and the causes of death have not yet been released.

The water temperatures were near freezing and at 30 and 40 degrees on Saturday, Mackert said.

According to seagrant.umn.edu, a person can swim for about seven minutes in this cold water for around seven minutes before they become exhausted.

“In water that is around the freezing point, a person is likely to survive only 15 to 45 minutes,” it said.

Mackert believes that one of the men fell overboard, and the other turned the boat around to retrieve him. Instead, the man driving the boat also fell into the lake.

“(He) attempted to get that person out of the water, and, somehow in that process, that person fell out of the boat, and the boat got put in full throttle,” he said. “I don’t know exactly. It’s purely speculation on my behalf. We’ll never truly know.”

Mackert reported that a man contacted him about what he saw over the weekend at Henrys Lake.

“We had a guy call me and told me he had gotten on the lake at 3 (p.m.) on Saturday and stayed until approximately 6 (p.m.) and didn’t see another boat on the lake,” he said. “I’m guessing it happened somewhere between 12:30 (p.m.) and 3 (p.m.) I’m betting it happened more closely around 1:45 (p.m.).”

Numerous agencies helped with the search and included not only FCSAR but also Fremont County Sheriff’s deputies, Bonneville and Bingham County first responders as well as canine search and rescue dogs from Wyoming Canine Search and Rescue Dogs, Jackson Hole Search Dogs and Idaho Search Dogs to assist in finding the missing men.

“The dogs for sure are helpful,” said Fremont County Sheriff’s Sgt. Cody Gudmunson. “Anything’s helpful at that point.”

The weekend’s event was the first one where FCSAR was needed since the first of October.

“It’s been a while,” he said. “We like to keep it that way.”