Dos Ojos (from Spanish meaning "Two Eyes"; officially Sistema Dos Ojos) is a flooded cave system located north of Tulum, on the Caribbean coast of the Yucatán Peninsula, in the state of Quintana Roo, Mexico. The exploration of Dos Ojos began in 1987 and still continues. The surveyed extent of the cave system is 82 kilometers (51 mi) and there are 28 known sinkhole entrances, which are locally called cenotes. On these dives, we explored what is called the Barbie Line (you will see Barbie in the mouth of a crocodile in one of the photos) and the Bat Cave on the second dive. We surfaced in the bat cave, there are several photos of the bats and their home.