Remains of two cave divers who vanished during a 1979 expedition at Jacob's Well in Texas were discovered 20 years later, closing a search that included a 12-day recovery mission and a near-fatal rescue attempt.
Kent Maupin and Mark Brashier, both 20, disappeared on the evening of September 9, 1979, after entering a restricted section of the cave system near Wimberley, Texas. The pair were part of a diving party and had reportedly expressed interest in exploring an area 75 feet below the surface, past the safe portion of the cave, featuring a narrow and confined tunnel.
Search and Recovery Efforts
By 1979, at least four divers had reportedly died attempting to access that section. The diving community was split over whether the passage was a dead end or opened into a larger cavern linked to the Edwards Aquifer. Maupin, an assistant diving instructor, and Brashier passed through the narrow opening in the limestone bed of Cypress Creek, navigating the first section that plunges about 25 feet to a visible ledge before venturing deeper.
Neither diver carried spare lights or a safety line, and both removed their air tanks to squeeze through the passage, according to a Texas Monthly article. Fellow diver Joe Moye, part of the same expedition, tried to caution the men but failed. Low on air, Moye struck his tank with a knife to alert them, got no response, and ascended to the surface, where he saw the water turning a dense, murky brown.
Rescue Attempt and Aftermath
Recovery teams, led by former Navy diver Don Dibble, began searching in the early hours. Gravel had almost entirely blocked the passage, and clearing it caused loose debris to cascade, endangering those below. Dibble, investigating with game warden Calvin Turner, became trapped when a gravel avalanche pinned both his arms. Running low on air, he detached his regulator, believing he was about to die, but Turner rescued him with a spare regulator. Dibble sustained a ruptured stomach wall and contracted peritonitis.
Sarah Cargill, present at Jacob's Well with her family, told The Chron: "It was just horrible. We had been on other dives with Kent and knew his family, and we just couldn't believe it had happened. Kent's parents stood on the banks of that river for a week, waiting for his remains to be brought up." Maupin's father said: "I didn't want them to continue trying to get to him. I was afraid somebody else might get hurt or even die, and I just didn't want that to happen."
A commercial diving firm, commissioned by the families, continued the search with a decompression chamber and airlift system. An underwater camera revealed a scuba tank valve and regulator mouthpiece past the blockage, but after 12 days of clearing, the mission was called off. Months later, Dibble returned with a team to seal the passage with cement.
Discovery Two Decades Later
A decade on, most of Brashier's remains emerged, but Maupin's stayed missing. In 2000, Malcolm and Mary Ellen Maupin learned their son's remains may have been found during a routine mapping expedition. Wade Parham of the San Marcos Area Recovery Team said the group "happened upon" the remains and noted the grate installed by Dibble was no longer protecting the entrance. Malcolm Maupin said: "It's so hard to relive it after so long. I wish I had been there that night. Our family went on a lot of dives together over the years, and I never would have let him go in there. I might still have a son if I had been there."
