SPRING VALLEY — On top of the usual dangers of cave exploring, spelunker John Ackerman worries that a BP pipeline running through Spring Valley Caverns will one day break, endangering fellow cavers ...
SPRING VALLEY, Minn. (AP) — John Ackerman is a big-time landlord of subterranean real estate. Ackerman, 59, owns Spring Valley Caverns, the largest private cave in Minnesota but just the beginning of ...
SPRING VALLEY -- For his love of caves, John Ackerman has fallen into deep pits, nearly drowned in an underground stream, and barely escaped being crushed by tons of rock. It's no wonder his wife ...
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