Photo 6. Artist's rendering of central Chichen Itza around the year AD 1,000. View is from the north with the Castillo Pyramid in the center, Temple of the Warriors to the east, and a sacbe to the Sacred Cenote in the foreground. GPR survey was carried in the Great Plaza. A buried trench dug by the Maya was detected to the east of the pyramid during the 1993 survey season, and imaged again during 1997. Additional GPR surveys are planned in order to provide 3-D imaging of the buried trench which may be associated with a cave under the pyramid.