JACKSONVILLE (CNN) – A possible clue has surfaced on Day 3 of the search for two firefighters who disappeared after setting out from Port Canaveral on a fishing trip.

A gear bag was found floating in the ocean Monday about 50 miles east of Jacksonville, according to the Coast Guard.

The wife of Brian McCluney, one of the missing men, said on Facebook that the bag belonged to him.

“I wholeheartedly believe this is a bread crumb they [threw] overboard to say, ‘We are here, come find us,'” Stephanie McCluney posted.

Authorities say they have searched an estimated 24,000 square miles of ocean for the men.

McCluney and Justin Walker were last seen Friday morning on surveillance video launching their boat into the water at the 300 Christopher Columbus boat ramp, according to the Coast Guard. Their destination was 8A Reef, an offshore fishing spot.

Family members contacted the Coast Guard after the men didn’t return Friday evening. Both men have been identified as firefighters — McCluney with Jacksonville Fire and Rescue and Walker with Fairfax County, Virginia, Fire and Rescue.

The Coast Guard, along with multiple local and county agencies, started searching by boat and air on Friday night.

“I hoped that by daylight it would bring us something,” McCluney’s wife, Stephanie, said Saturday. “I understand it is like a needle in a haystack. But these two men are probably the most resourceful men.”

The men’s boat belonged to McCluney’s father, who passed away last month, according to McCluney’s brother, Kevin. McCluney’s wife said that the boat has had mechanical problems in the past.

By Monday morning, the Coast Guard said its boats and an airplane had searched an estimated 24, 000 square miles — as far north as the Georgia coast — trying to locate the fishermen. Dozens of good Samaritans with boats also have joined officials in the search effort.

“Want to know about our bond with each other? These are the times that we come together to accomplish amazing things…we have about 11 boats with nearly 50 firefighters assisting @USCGSoutheast with search out of Vilano and Daytona beach this am,” tweeted the Jacksonville Fire and Rescue Department.

As the search continues, the Coast Guard is asking for anyone with information to call 904-714-7558.

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