The search for Brian Laundrie continues in Florida, and authorities are now hoping to find something soon.

Police in North Port, Florida, told over the weekend that they wouldn’t be surprised if Laundrie, the fiance of the late Gabby Petito, was dead or alive.

North Port police officer Josh Taylor told said that authorities have not found anything in the 25,000-acre Carlton Reserve yet. But the pressure is on the find something soon, he said.

“We need to find something. I think there’s so much attention on this. I don’t know that this case would ever get to be a cold case,” Taylor said. “We’ll continue to search. You know, we could be searching that Carlton Reserve and nearby lands for a long, long time.”

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Laundrie is a person of interest in the disappearance of Petito. Petito and Laundrie went on a cross-country road trip this summer. But only Laundrie returned home to North Port on Sept. 1, driving Petito’s van. On Sept. 11, Petito’s family reported Gabby missing.

On Sept. 17, the Laundrie family told police that Laundrie had been missing for days, having last seen him on Tuesday, Sept. 14 (their story later changed to say they had last seen him on Monday, Sept. 13). Laundrie has been missing ever since.

Days later, on Sept. 19, Petito’s body was found in Wyoming. She was later confirmed to have died by homicide.

Since then, there have been a number of tips about Laundrie’s whereabouts. Hikers on the Appalachian Trail said they saw Laundrie. North Carolina residents have sent in tips that they’ve seen Laundrie in the state. Police have been investigating these tips, but nothing has popped up.

The FBI and the North Port police are still focused on the Carlton Reserve.

But Robert Urban, founder and chief instructor of the Urban Survival Academy, told CNN that it’s unlikely someone could survive in the Carlton Reserve for a month — unless they have major survivalist skills. The reserve is packed with wildlife — ranging from alligators to even, potentially, panthers.

“Florida’s climate is very, very difficult,” Urban told CNN. “I’m an expert with plenty of experience, and it would be everything that I could do to survive for (more) than three weeks. Someone with no experience, you cannot be lucky and survive in that sort of climate.”