In this Jan. 4, 2013 photograph, a couple takes a picture while swimming in the Gran Cenote, a water cave near Tulum, Mexico. The water caves are popular destination among tourists visiting the beaches and resorts of the Yucatan Peninsula. (AP Photo/Manuel Valdes)

Associated Press
In this Jan. 4, 2013 photograph, a couple takes a picture while swimming in the Gran Cenote, a water cave near Tulum, Mexico. The water caves are popular destination among tourists visiting the beaches and resorts of the Yucatan Peninsula. (AP Photo/Manuel Valdes)
In this Jan. 4, 2013 photograph, a couple takes a picture while swimming in the Gran Cenote, a water cave near Tulum, Mexico. The water caves are popular destination among tourists visiting the beaches and resorts of the Yucatan Peninsula. (AP Photo/Manuel Valdes)
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