Home / Environment / Daring Divers Map World's Largest Submerged Cave
Daring Divers Map World's Largest Submerged Cave
24 Nov, 2025
Summary
- World's longest underwater cave system spans 325.6 miles.
- Explorers discovered ice palaces and 38 unique cave species.
- Exploration began in 1996, with significant expansion since.
Beneath the Yucatan Peninsula lies the Ox Bel Ha, the world's most extensive underwater cave system, stretching over 325 miles. This submerged labyrinth boasts immense chambers, glittering crystal formations known as 'ice palaces,' and a diverse array of 38 unique cave-dwelling species. The system's formation millions of years ago, followed by a significant sea-level rise, created its complex, water-filled environment.
Exploration of Ox Bel Ha commenced in 1996, with dedicated research groups like CINDAQ continually charting its intricate tunnels. Divers navigate a challenging halocline, a mix of fresh and saltwater, while managing oxygen supplies in passages that can be as tight as dry caves. Despite inherent dangers, recent expeditions have uncovered over 108 miles of new passages since 2018 alone.
The ongoing mapping efforts, though perilous, continue to reveal the hidden wonders of this subterranean world. While the Ox Bel Ha is the longest underwater system, it is surpassed in total length by Kentucky's Mammoth Cave, which is a dry cave. The discovery and ongoing exploration of Ox Bel Ha underscore the vast, unexplored frontiers remaining on Earth.
