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"A do-able day-trip for cavers, this subterranean route plunges visitors into complete darkness (save for headtorches) as they squeeze through river passages, wade underground pools and pass from slender canyons into enormous chambers before reaching a vast subterranean lake. The experience combines wet passages and dramatic cavern space and can be booked as a single-day excursion or linked with nearby caves on multi-day trips with licensed operators." - Joshua Zukas