The massive effort to find two teens from Palm Beach County who disappeared at sea will continue Tuesday night off the coast of South Carolina, the U.S. Coast Guard said.
Perry Cohen and Austin Stephanos -- both 14-year-old avid fishers who are neighbors and best friends -- could survive in the water for four to five days, Capt. Mark Fedor said Monday. Tuesday was the fifth night.
"As each hour goes by, the situation becomes dire," Fedor said in a statement.
The U.S. Cost Guard announced Tuesday night that the search-and-rescue mission had scanned nearly 31,000 square nautical miles from Jupiter to Charleston, South Carolina.
Although desperation was kicking in, the families' hope was still alive.
"My gorgeous boy, hold on tight," Perry's mom, Pamela Telvi Cohen, said on Instagram. "The entire world is praying for you and Austin ... we will find you."
WATCH VIDEO: Pilot Jim Faulhaber shares video of search Tuesday
After the boys' 19-foot capsized boat turned up Sunday off of the coast of Daytona Beach, the family learned that there was a possibility that they were using life jackets and a white Yeti cooler to stay alive. The black engine cover was also missing.
"We know that they are doing everything that they possibly can to stay afloat," Cohen said.
The family was asking volunteers to comb beaches and keep an eye on coastline debris in Florida, Georgia and South Carolina. Government and private ships, boats, planes, helicopters and even a drone scattered off of the southeast coast, a relative said.
There have been some false alarms. Tuesday there was fear when a boater reported spotting a similar cooler, but the U.S. Coast Guard later confirmed on Twitter that it was not the one that the boys had.
SOCIAL MEDIA: View one of Austin's last shares on Snapchat
The Coast Guard also warned that although the rescue team -- which includes the U.S. Navy, U.S. Air Force and Customs and Border Protection -- was "aggressively" searching for them, there were challenges.
"When a person is in the water, you are basically looking for the chest up, so it's a relatively small object you're looking for," Fedor said.
Coast Guard Lt. Commander Gabe Somma added that there was "an awfully strong current."
The day the boys went missing there were thunderstorms. A fisherman told The Palm Beach Post that as he was trying to get away from a mean storm, he saw two teens moving toward it. The boat, he said, fit the description.
TIMELINE & MAP: Click on updates on teens disappearance
SEARCH-AND-RESCUE TEAM
The U.S. Navy, U.S. Air Force, Customs and Border Protection, Flagler County Sheriff's Office and the Florida Fish and Wildlife Conservation Commission are some of the agencies involved.
The U.S. Coast Guard's assets include six cutters (Maria Bray, William Flores, Shrike, Yellowfin, Sawfish and James). Coast Guard small boats from stations Ponce de Leon Inlet and Port Canaveral were also searching. And on the air, HC-130 Hercules airplanes from stations Elizabeth City, North Carolina and Clearwater were also searching.
There were prayer vigils Sunday and Monday in Palm Beach County. The Tequesta Police Department used Twitter to thank a large crowd for attending a vigil Monday night.
There were more candlelight vigils planned for Tuesday and Wednesday night in Jupiter, Cocoa Beach, Stuart and Pompano Beach.
Several psychics who specialize on cases of missing persons said the families needed to search south and not north as maritime logic indicates, Gossip Extra's Jose Lambiet reported.
According to the report, a volunteer said a group spent the weekend in the Bahamas telling locals about the families' $100,000 reward.
SLIDE SHOW: View photos of search from the U.S. Coast Guard
The boys' moms, Cohen and Carly Black, were on "Anderson Cooper" Monday night and on the "Today Show" Tuesday morning. Black said her son was like a "little MacGyver," a fictional top agent who uses scientific knowledge to survive and solve problems.
SOCIAL MEDIA
Families' GoFundMe account reached $117,000. Highest anonymous donation was $20,000.
Join Facebook Group organizing vigils to pray for a miracle in Pompano Beach
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Austin "has been on the water since before he could walk. This is his fourth boat. This isn't new to them ... it's not even second nature at this point," Black said. "It's in their blood. This is something they have prepared for their whole boating life. They are out there."
Follow Local 10 News reporter Andrew Perez on Twitter @PerezLocal10
Map: Austin and Perry
The Associated Press and ABC News also contributed to this report.