When Coast Guard pilot Lt. Ian Logan went out to search the waters off Longboat Key in the wake of Hurricane Milton roaring ashore on the western Florida coast, he didn't expect to find anyone who needed help.

To all of their surprise, he and his crew found a man clinging to a cooler 30 miles out in the Gulf of Mexico.

"We thought it might've been a buoy," Logan said. "I remember looking down and seeing the strobe and like seeing him holding on to the cooler. So once we pulled up in that 50-foot hover right next to the guy, we're like, 'Oh my gosh, he's on like a cooler that's opened up and he's just floating on it,' which is insane."

The man had gone out to his boat early Wednesday to make repairs after it became disabled earlier that week approximately 20 miles off John's Pass, a barrier island west of St. Petersburg, according to the Coast Guard. As he was bringing the boat back to port, it got disabled again, the Coast Guard said.

The man contacted the Coast Guard, hoping for help. But weather conditions had already started to deteriorate as Milton approached Florida's west coast, and the Coast Guard said it instructed him to put on a life jacket and "stay with the vessel's emergency position indicating radio beacon." The Coast Guard said it then lost contact with the man at 6:45 p.m. ET Wednesday.

By the time he was found, with his boat long gone, Logan said the man was essentially strapped to the cooler.

"I didn't believe it at first. There are a lot of questions going through my head. So I paused for like, 10 seconds, as we're making this turn, going to make our approach to the water," Logan said. "And I'm like, 'Are you sure?' And the swimmer is like, 'Yes, he's waving his hands at us like, this is the guy.' And I remember all of us are like, 'My goodness, I can't believe we're so excited that we found this guy.' Like searching for a needle in a haystack."

When he was brought up by the Coast Guard swimmer, Logan said it was like something out of a movie.

"I look back over my shoulder and he's over my back right shoulder and I see this guy -- hair looks like the 'Castaway' movie, where he's covered in salt," he said. "He's got a life vest on, he's soaked. And at that point, it really set in, like, 'Oh my God, I can't believe we just found this guy.'"

Logan said the moment was one of the highlights of his career.

ABC News' Leah Sarnoff and Meredith Deliso contributed to this report.