eakdown collapse and a 2~meter pit. Aspart of the group surveyed from there backto their previous station, Serge and theLittle Swiss went ahead down the 20-meterpit. Eventually they came to a deep dropof nearly 140 meters. To avoid the water,multiple rebelays were necessary. A futuretrip saw Serge, Georges, and Richard returnto the 140-meter pit. Beyond the bottom ofthe pit they encountered numerous drops andwaterfalls. They had a difficult timenegotiating the drops without getting wet,and the wind in the passage alwaysthreatened to extinguish their carbidelamps. The passage eventually became verymuddy and then intersected a larger streampassage. They followed the new stream downa series of small drops <strong>for</strong> 150 meters to asump at a depth of 700 meters. Be<strong>for</strong>eretreating to the surface they looked atsome high leads back up the passage, butthey were iUlpossible to get into since itwas so muddy. They also mapped 150 metersupstream to a dome and a pit. They took abath in a waterfall and headed out.Another group returned to the 25-meterpit Serge had discovered in the fissurenetwork. They found an alternate routedown to the bottom and explored downstream.The large passage soon turned into acrawlway with lots of sharp <strong>for</strong>mations.They intersected a large cubical room withdimensions of 30 by 30 meters, but acrawlway led out of this room. Theyfollowed it <strong>for</strong> about 150 meters. Itcontinues with some airflow.The same day another team surveyed thelarge hall, took photos, and discovered avery large pit-passage in the lower sectionof the room. That re-fired interest in thecave and a team returned later to exploreit. They discovered that it connected intoknown cave at the -350 level above the 140meter pit.About 4 kilometers of passage wasdiscovered in Aztotempa. The depth of -700meters was the deepest point reached by theexpedition. The potential <strong>for</strong> morediscoveries is great. Two downstream leadsremain, one at the ceiling at the -670meter level, the other in a passage atabout -250 meters, and there are fourupstream leads. All of the leads hadperceptible airflow.Expedition Members: Patrick Bestgen, MarcBirchen, Serge Delaby, Michel Dupuis,Georges Feller, Richard Grebeude, FrancoisGUinand, Jean-elaude Hans, Philippe Hubert,Jocelyn Kirsch, Jean-Claude London,Francois Saussus, Rene-Marc Thirion, ManuelTries, Francois Vivier, PatrickVanstraelen.BXPEDICION BELGICA 1985El expedicion 1985 a Puebla descubrio un total de 35 kilometros depasajes en varias cuevas. La·s dos mas importantes son Coyalatl y Aztotempa.Coyalatl es una resurgencia cerca de Tlacotepec de Diaz con una longitud de 19kilometros y una altura arriba de la entrada de 240 metros. Aztotempa, 10calizada a los 1400 metros a1trua snm, tiene 4 kilometros de pasajes, yterminaron a -700 metros de profundidad en un sifon. Tambien exploraronmuchos sotanos profundos y cuevas chicas.58
Underwater <strong>Cave</strong>rns ofQUINTANA ROOby James CokeIn the last few years a whole new areaof cave exploration has opened in Mexico'snewest state, Quintana Roo. This is thesystematic study of underwater caves byproperly trained and equipped explorers.The Yucatan Peninsula has long been knownas a rich karst area. One could cite thefamous Sacred Well of Chichen Itza and theBolonchen as prime examples. These northerncaves have become favorites <strong>for</strong> touristsand explorers due to their accessibilityand proximity to several large cities.Quintana Roo, however, has had relativelyfew speleological studies due to past remotenessfrom civilization. Only in thelast decade have modern roads and townsbeen built, largely as result of growingtourism.At the present time more than 20 individualunderwater cave systems have beenexplored, each having its own particularcharacter. caves laying 6 to 10 kilometersfrom the coast tend to be different thanthose caves nearer the coast. Large domerooms, complex tunnel systems, and highlydecorated ceilings and walls constitute thecharacter of these inland caves. Access isgained to the inland cave systems throughcenotes. Cenote is a Mayan word <strong>for</strong> acollapsed sinkhole filled with water.Above: Johanna deGroot in Cenote Hermana de Naharon.(James Coke)59