Deep in the west Texas desert lies Phantom Springs Cave. Exploration divers there hit a record depth of 462 ffw / 140.8 m, making it the deepest underwater cave system in the United States!
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Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic.
Note that Bushmansgat is located 1550 m/5000 feet above sea level. When adjusted for altitude, Gomes' dive was equivalent to a sea level dive to a depth of 339m/1,112 ft making it the deepest cave dive on record.
Mammoth Cave is currently mapped and explored at 426 miles (686 km), but that is just what has been discovered to date. The Cave Research Foundation (CRF), an official park partner, has mapped and explored Mammoth Cave since the late 1950s.