Underwater Cave Reports
Measurements, sources, and exploration updates for underwater cave systems. Browse length and depth reports, search by system or location, compare source details, and submit new reports or exploration news for review.
What you can do here
Use the site to find underwater cave systems, check reported measurements, follow linked sources, and see recent exploration updates. If you have a newer report, a missing source, or a connection between systems, open the system page and submit the information with a citation or URL.
Length reports
Underwater cave systems with reported length measurements.
| # | Cave | Location | Length | Source |
|---|---|---|---|---|
| 1 | Sistema Ox Bel Ha | Tulum, Quintana Roo, Mexico | 541,791 m | CINDAQ 2025 Annual Report Primary source |
| 2 | Sistema Sac Actun | Quintana Roo, Mexico | 379,569 m | QRSS Long Underwater Caves Secondary source Provided by: Alvarez/Nava/Reato/Picard |
| 3 | Sistema K'oox Baal | Quintana Roo, Mexico | 123,000 m | Facebook Report Primary source Provided by: Robbie Schmittner |
| 4 | Wakulla Cave System | Leon/Wakulla, Florida, USA | 72,171 m | Cave-Exploring World Long Caves Secondary source Provided by: Casey McKinlay e-mail |
| 5 | Arresteliako ziloa Also: Souffleur de Larrandaburu | Pierre Saint Martin, Pyre. Atlantiques/Navarr, France | 60,943 m | Cave-Exploring World Long Caves Tertiary / aggregate source Provided by: Die langsten Unterwasserholensysteme der Welt |
| 6 | Sistema Xunaan Ha | Quintana Roo, Mexico | 57,344 m | QRSS Long Underwater Caves Secondary source Provided by: Quiet Diver Team |
| 7 | Sistema Toh Ha | Tulum, Quintana Roo, Mexico | 47,746 m | QRSS Long Underwater Caves Secondary source Provided by: Berni/Sieff |
| 8 | Sistema Zapote-Camilo Also: Cenote Zapote, Sistema Camilo | Quintana Roo, Mexico | 40,169 m | QRSS Long Underwater Caves Secondary source Provided by: Coffield-Feith/ Bulman |
| 9 | Sistema Nohoch Kai | Tulum, Quintana Roo, Mexico | 33,505 m | QRSS Long Underwater Caves Secondary source Provided by: Proyecto Nohoch Kai/ Schmittner/ Gugermeier |
| 10 | Sistema Caterpillar | Quintana Roo, Mexico | 28,253 m | QRSS Long Underwater Caves Secondary source Provided by: DRSS/QDT |