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Sistema Dos Ojos

Dos Ojos is a flooded cave system located north of Tulum, on the Caribbean coast of the Yucatán Peninsula, in the state of Quintana Roo, Mexico. The exploration of Dos Ojos began in 1987 and still continues. The surveyed extent of the cave system is 82 kilometers and there are 28 known sinkhole entrances, which are locally called cenotes. Dos Ojos lies broadly parallel to and north of the Sac Actun cave system. Dos Ojos has remained in the top ten, if not the top three, longest underwater cave systems in the world since its discovery in the late 1980s. Dos Ojos contains the deepest known cave passage in Quintana Roo with 119.1 meters of depth located at "The Pit" discovered in 1996 by cave explorers who came all the way from the main entrance some 1,500 meters away. The deep passages include the "Wakulla Room", the "Beyond Main Base passage", "Jills room" and "The Next Generation passage". In August 2012 Dos Ojos was connected through a dry passage to Sistema Sac Actun. With March 2014 the total length of the combined system measures 319.05 kilometers . Dos Ojos is an anchialine cave system with connections to naturally intruding marine water and tidal influence in the cenotes. The coastal discharge point of this cave system have not yet been humanly explored through to the ocean, although large volumes of groundwater were demonstrated by dye tracing to flow towards Caleta Xel-Ha, a nearby coastal bedrock lagoon. 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. Water temperature is 25 °C or 77 °F throughout the year and the maximum depth near the Dos Ojos cenotes is approximately 10 meters . The water is exceptionally clear as a result of rainwater filtered through limestone, and there being very little soil development in this region since the limestone is very pure.

Sistema Nohoch Nah Chich

Sistema Nohoch Nah Chich is an extensive water filled cave system connected with the Caribbean Sea via a coastal spring called a variety of names, including Casa Cenote for the restaurant located nearby, but also Cenote Manati, or Cenote Tankah. The explored cave system extends to approximately 8 kilometers inland from the coast. It is located 16.5 kilometers south of Akumal . For more than ten years the system was extensively explored by dedicated cave divers starting from Cenote Nohoch Nah Chich in 1987. Mike Madden of CEDAM Dive Center established the CEDAM Cave Diving Team principally to conduct annual exploration projects to focus on cave exploration, while a number of cave research efforts were logistically supported, with contributions in the fields of karst hydrogeology, water chemistry, microbiology, ecology, and archaeology. The technique of establishing jungle exploration camps at newly found cenotes and cave entrances was developed and refined during many cave exploration projects, thus allowing cave diving exploration effort to continue more efficiently at the edges of the known cave. The main camp of exploration became Cenote "Far Point Station", located 6 kilometers from the coast, and 2.8 kilometers further inland than Main Base Camp situated at the main Nohoch Nah Chich Cenote entrance. During the Nohoch 1997 expedition the 60 kilometers of total explored cave passage mark was surpassed. In early 2007, Nohoch Nah Chich included 36 cenotes and had a recorded length of 67 kilometers when it was connected into and subsumed into the 14 kilometers longer Sistema Sac Actun by the Sac Actun Exploration Team . This portion of the system is now called the "Nohoch Nah Chich Historical section", where with 71.6 meters also the greatest depth of the entire system was reached at "The Blue Abyss".

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