Six volunteer cavers were greeted like returning astronauts Monday night after they emerged from mapping the 200th mile of Jewel Cave and reported the discovery of a stalagmite that could be the cave’s largest.
About 50 people were on hand at Jewel Cave National Monument for a potluck and a celebration of the mapping milestone. The greeting party included 94-year-old Jan Conn, who pioneered the exploration and mapping of the cave with her late husband, Herb, during a 22-year period beginning in 1959.
https://rapidcityjournal.com/news/local/explorers-map-th-mile-of-jewel-cave/article_d374c7a3-4902-515c-8e78-8f3a2b3c805d.html
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