Altar Maya cave system
Also known as CUTS (Cave Under The Sea), Tancah, Doorway [Portal] Under the Sea
Area: Tulum North
Length: 2,223 m
Maximum depth: 15.2 m
Exploration
2001 - Nicolai Toussaint et al.
2004 - D. Rissolo, Bil Phillips, Sam Meacham
Disto and Brunton survey (submerged petroglyph, petroglyphic stairway, stela).