Day 180 : Cenote Originally uploaded by Jess and Colin Cenotes are caves that formed in collapses in the limestone plateau that is the Yucatan and then filled up with water . Some of them are part of the world 's longest underwater cave system . ( Probably more of them than we can verify , because many of the passages are too small for people or remote cameras to traverse ) .
Question: What may be the reason these pictures are being uploaded ?
The answer to the above question:


We are sharing the pictures we took on our extended research trip .