A woman's worst fears came true on Christmas Day when her fiancée and his teenage son did not return from a dive in a notoriously dangerous area of underwater caves, ABC News reported.

The bodies of Darrin Spivey, 35, and his son, Dillon Sanchez, 15, were found in an underwater cave in an area known as Eagle Nest Sink in northwestern Hernando County in Florida on Wednesday night.

Despite Spivey being a certified diver, he wasn't certified to cave dive. His son was not certified to dive at all, friends told the Sheriff's office. The two decided to make the trip after Sanchez received some new diving equipment for Christmas and wanted to test it out at Eagle Nest Sink.

Spivey's fiancée, who asked to remain anonymous, told ABC News that she's still trying to process everything that's happened. After attempting to reach the pair numerous times, she called 911.

"I called friends and family that were more experienced to ask if I should be worried, and then I made the call," she said after no contact from Spivey.

A report was filed to the Hernando County Sheriff's Office. A hunter informed authorities that he saw the father-son duo suited up and ready to go at 11 a.m., but when he returned at 6:30 p.m., he only saw their car, no divers in sight, according to the police report.

Located near Weeki Wachee, Fla., in the Chassahowitzka Wildlife Management Area, Eagle Nest Sink is a large underwater cave system. Known as the Lost Sink and revered as the "Grand Canyon" of the diving world, it's notoriously dangerous, but still draws divers from around the world.

A certified underwater emergency recovery diver, Eric Deister, started searching at 8:30 p.m., according to Hernando County Sheriff's Office. Sanchez's body was found inside a cave at 67 feet by Deister. After enlisting the help of two other divers, Robert Brooks and Matthew Vinzant, the three were able to locate Spivey at 127 feet, ABC News reported.

The Medical Examiner took custody of the bodies, and will determine the exact cause of death.