Submitted by coldrum ---
Machete chops echo and leaves rustle underfoot when the vines clear, revealing cobalt-blue water in a cliff-sided pool. Hidden beneath the dry-season forest, these waters, the blue cenotes (cen-NO-tays) of Cara Blanca, represent a mystery for scholars, one left by the ancient Maya. What lies within these sacred wells?
"Cenotes were portals to the underworld, Xibalba, for the Maya," says archaeologist Lisa Lucero of the University of Illinois at Urbana-Champaign on a tour of the pools in May. "Offerings, artifacts — they would have left something there for the gods. We would expect to find something."
But the gods of Xibalba (shee-BALL-buh) won't yield their offerings so easily.
The secrets of the ancient Maya, whose Central American population centers were mysteriously abandoned more than a millennium ago, have long intrigued scientists. Why did such a complex culture disappear?
Lucero and her colleagues are among those trying to understand this lost world. They have been searching the 6-mile-long Cara Blanca site for ruins since 1998, working each year primarily in May and June, before the rainy season.
A team of world-class cave divers assembled by Lucero and geologist Patricia Beddows of Northwestern University in Evanston, Ill., intend to descend into the depths of three of Cara Blanca's 23 pools next year. Hazards the divers will face include trees, caves and crocodiles, not to mention 160-foot depths. "Cenotes bell outward underground, like caves. You can't treat them like there is clear water over your head. The waters are sulfur-rich. Hydrogen sulfide can make divers sick if they push it, which has happened," Beddows says. "And there is the depth problem." Dives in very deep waters put divers at risk of serious health problems, especially if they surface too quickly.
Plumbing the blue depths
The ancient Maya lived in Central America's lowland forests for thousands of years, starting around 300 B.C. to build a culture of widespread centers marked by pyramids and temples and, stone carvings suggest, ruled by a caste of boastful chiefs. The Maya abandoned these centers around A.D. 900, a mysterious "collapse" ascribed by scholars to warfare, drought, overpopulation and environmental degradation, or a combination of each.
Spanish conquistadors met Maya descendants still living near centers in Mexico's Yucatán in the 1500s, and today some 6 million Maya still live in Mexico, Guatemala, Belize and elsewhere. "The Maya didn't go away, but their rulers did," Lucero says.
In 1904, Harvard's Peabody Museum archaeologist Edward Thompson dredged the Sacred Cenote at Chichén Itzá in Mexico's Yucatán. He found masks, jade, images of the rain god Chak and human bones. Later dives at Guatemalan lakes near Maya ruins found similar offerings.
Cara Blanca ("White Face," named after the cliffs above the pools) is itself a mystery to Lucero and her colleagues. Despite the cenotes' year-round water supply, they occupy a no-man's-land between two ancient Maya settlements, the midsized center called Yalbac and a smaller one that's called, in scientist-speak, M195. The smaller settlement is dominated by a 36-foot-high pyramid. The simple answer might be that the cenotes' salty water is undrinkable. Or it might have been sacred. Or both.
In a survey last year led by archaeologist Andrew Kinkella of Moorpark (Calif.) College, field researchers mapped Cara Blanca's swath of forest encompassing the pools and determined that only a few structures once lined one pool and one large structure existed between two of the cenotes that the explorers think hold the most promise as sources of artifacts.
"We think they were sweat lodges," Kinkella says, places of purification before offerings were made to the pools. "Sweat lodges are important places in many Native American traditions. Have you ever been in one? It's not a day at the sauna. It's an intense experience. You basically come out of them feeling like you are going to die."
To explore the pools, Beddows has picked world-class divers, including cave explorers Jill Heinerth, Steve Bogaerts and Bil Phillips, documentary veterans familiar with Yucatán caves whose experience adds up to more than a century of "technical" diving experience. "We will treat it as a cave-diving situation," adds Beddows, who has arranged for British military personnel (who train in Belize) to provide medical support, if needed, for the expedition.
The team plans about five three-day dives in Pools 1, 2 and 16 of Cara Blanca, with two-day breaks to recover between sessions, and to tag and conserve any artifacts turned up during exploration. They will take 12-foot cores of the bottom and map the cenotes, looking for clues to their geology, and the sulfur-rich chemistry that colors the pools an unearthly blue. "The color is striking and would have interested the Maya," Beddows says.
Her chief worry is the logs and vegetation at the bottom of the cenotes, which can create a spiked wall for heavily equipped divers who can see only a few feet in the depths. "At the bottom, the chemistry leads to a thick bacterial covering and, very quickly, complete darkness," she says. These oxygen-poor waters at the bottom of the wells should serve to preserve artifacts, but they also preserve trees that have fallen in over the years. "Some of what we will be doing will be essentially gardening to clear the site," she says.
For more, see USA Today.
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