Treading water in a swimming pool for more than 10 minutes can be a tiring experience, but what about treading water in the ocean for 14 hours without a life jacket?

CNN reports that 50-year-old Sean McGovern and 52-year-old Mellisa Morris did exactly that after they fell off their boat in Key Largo on Friday. Amazingly, McGovern and Morris were found by a group of off-duty sheriff’s officers.

“They are very lucky — they didn’t have any signal device,” said U.S. Coast Guard spokesman Mark Barney, according to CNN.

Barney noted that the two individuals were treated for mild hypothermia and jellyfish stings before being taken home by friends.

“As empty as the ocean was today, with only another two or three boats, they might have been out there for another two or three days,” Keith Salvis, of the Broward Sheriff Office’s fire rescue department told a local NBC affiliate, according to Reuters.

McGovern and Morris explained that the boat was in gear when they fell overboard, leaving the boaters to watch in horror as it took off without them.