Juergen Horn and Mike Powell are moving to a new place for 91 days at a time, and in that amount of time, you have to pack in a lot of exploring and sightseeing! After leaving Iceland, they are now in Yucatan, Mexico, where they visited the Río Secreto, an underground river that flows through beautiful cave chambers.
After a bumpy bus ride to the site, we put on wet suits and helmets, and followed our guide into the woods. Soon, we had arrived at a gateway into the underworld. The scene that awaited us inside was breathtaking: a cave full of stalactites and stalagmites, perfectly illuminated by light filtering in from above and reflecting off the still blue water. Although it had long been known to locals, Río Secreto was only discovered by the world at large in 2007, and was immediately put under governmental protection. So the condition of the caves is stunning.
There's lots more pictures at For 91 Days, including a huge arachnid of some sort that startled me. Otherwise, they show a beautiful underground trip. -Thanks, Juergen!