1966day.year
The Cave of Swallows, the largest known cave shaft in the world, is discovered in Aquismón, San Luis Potosí, Mexico.
Explorers uncover the Cave of Swallows in Mexico, revealing the world's largest known cave shaft.
On December 27, 1966, cavers in Aquismón, San Luis Potosí, Mexico, discovered a vast chasm now known as the Cave of Swallows (Sótano de las Golondrinas). The vertical shaft plunges over 370 meters, making it the deepest known pit cave in the world at the time. Its immense opening and sheer walls create an otherworldly spectacle, attracting researchers and adrenaline-seeking visitors. The cave is noted for its unique ecosystem and the thousands of parakeets and swifts that circle inside the shaft. Today, it remains a premier destination for professional cavers, base jumpers, and eco-tourists drawn by its natural grandeur and challenging depths.
1966
Cave of Swallows
Aquismón
San Luis Potosí