The name Dos Ojos refers to two neighbouring cenotes that connect into a very large cavern zone shared between the two. These two cenotes appear like two large eyes into the underground. The original cave diving exploration of the whole cave system began through these cenotes. The Dos Ojos underwater cave system was featured in a 2002 IMAX film, "Journey Into Amazing Caves", and the 2006 BBC/Discovery Channel series "Planet Earth". Parts of the Hollywood 2005 movie "The Cave" were filmed in the Dos Ojos cave system.