A smelly Steamboat curiosity yields an extraordinary scientific discovery.
SULPHUR CAVE has never been a big secret. Cavers know it's in downtown Steamboat Springs – a small, malodorous hole near the base of a travertine slope that is Howelsen Hill, Colorado's oldest operating ski area. But at a mere 10,000 years young, it isn't as old, pretty or big as other caves. It also has other things keeping it off most spelunkers' radar. "The signs that say you could die in there are very persuasive," says Rocky Mountain Caving editor Richard Reinhart.
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