Deepest underwater cave system in the United States in the middle of the desert? Yup, that’s part of the mystery of Texas springs.
Phantom Cave is in way West Texas, out near the Davis Mountains. According to Gunner Brune, author of The Springs of Texas, when the cave was first discovered by European settlers in the 1800s they tried to map its extent by swimming in with candles mounted to their heads.
Looks like they would have needed a lot more candles—the 2013 expedition dove more than 460 feet below the surface without reaching the cave’s end.