According to reports in number 173 of the Cave Diving Group
Newsletter, British cave divers Jason Mallinson and Rick Stanton
succeeded in passing Sump 2 in Pozo Azul, Burgos, Spain, the
culmination of a multi-year project involving numerous British and
Spanish assistants. Just reaching the start of Sump 2 requires a 250-
meter walk to the cave entrance, diving 700-meter Sump 1, a 300-meter
swim, and 100 meters of walking. As a result, camping between the
sumps has been used to enable the divers to get a fresher start in
Sump 2. Work in Sump 2, which reaches a maximum depth of 68 meters,
involved multiple scooters, rebreathers, and underwater habitats for
decompression. The ascent back toward the surface at the end of the
sump is paced by monitoring decompression obligation on dive
computers. The sump was finally passed on July 24, 2009, by Rick
Stanton, 140 meters beyond the end of Mallinson's line, at a total
length of 5160 meters. The dry passage ran only about 20 meters to new
Sump 3, dived for 160 meters by Stanton before he turned back.
Reaching the present end of Pozo Azul requires 6020 meters of diving.
"Future trips will concentrate on camping beyond Sump 2 and making
multiple pushes into Sump 3." Hardcore. -- Mixon
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