Cavers go deeper
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Cavers have ventured deeper into the Earth than anyone has been before.
A Ukrainian team has reached a record depth of 2,080m (6,822ft), passing the elusive 2,000m mark at Krubera, the world's deepest known cave.
The nine-strong group were part of a project that has made breaking the 2,000m depth its goal for four years.
They built on records set by a previous expedition, which blasted through blocked passages in the cave, within Georgia's breakaway region of Abkhazia.
"Even now, we don't know whether we've reached the limit - or if it will go on. We're pretty sure we'll eventually go even lower," said Alexander Klimchouk, the veteran caver who organised the mission.
The Ukrainian Speleological Association's Call of the Abyss project is funded by the US National Geographic Society.
During an expedition from August to September 2004, a team of 56 cavers (45 men and 11 women) representing seven countries explored Kubera, deep below the Arabika mountain massif of the western Caucasus.
Obstacle course
Carrying about five tonnes of equipment, they had to negotiate vertical drops and freezing torrents of water. They were also forced to blast rubble from passages that were critically narrowed or blocked by "boulder chokes".
Team members had to negotiate cold pools of water (Image: National Geographic)
They set camps at depths of 700m, 1,215m, 1,410m and 1,640m, where they cooked meals, slept up to six people to a tent and worked for up to 20 hours at a stretch.
They kept in touch with the surface base camp by rigging nearly 3km (two miles) of rope strung with a telephone wire.
But the August-September expedition encountered many obstacles. By the third week, a sump (cold pond in the cave) blocked the team's downward progress.
When team member Sergio Garcia-Dils de la Vega investigated if there was a way through, he survived a cascade of near-freezing water but was forced to retreat after discovering his waterproof dry suit had holes in it.
Deeper still
Finally, colleagues Denis Kurta and Dmitry Fedotov squeezed through a narrow, 100m-long passage, which successfully bypassed the sump and pointed steeply down.
The August-September mission paved the way for October's record (Image: National Geographic)
In October, a team of nine cavers was sent back to Krubera to pick up where the previous group left off.
They examined all unexplored leads in the cave's lowest section until they broke through to a new series of passages and vertical pits. On 19 October 2004, team leader Yuri Kasjan dropped down a pit and discovered from his altimeter that he had passed 2,000m.
More pits and passages brought the explorers to a sandy chamber at 2,080m, the deepest to date any human has ventured below ground.
The cavers christened the chamber Game Over. But team members now want to return to the cave to see whether it leads even deeper.
The record is announced in this month's National Geographic magazine.
Team members had to negotiate cold pools of water (Image:
National Geographic)
The August-September mission paved the way for October's record (Image:
National Geographic)