For adventurous thrill-seekers, caving is hard to beat. Combining climbing, diving, wayfinding and overcoming claustrophobia, it’s a unique skill set not for the faint of heart. Two gritty teams of hobbyist explorers are on the cusp of discovering new territory. Katie Graham is an accountant by day who is obsessed with the Bisaro Anima cave in the Rocky Mountains, and she is wi...