James M Tabor, BLIND DESCENT

Think "Journey to the Center of the Earth" times two. The split account (although the first, Bill Stone's adventure, gets many more pages than the second) of two men (and their crews, some of whom are women) exploring supercaves. The American Bill Stone explores Cheve Cave in southern Mexico; and the Ukrainian Alexander Klimchouk goes into the freezing supercave Krubera in the Republic of Georgia. Both are trying to find the deepest cave on earth. For those who liked "Into Thin Air" or books of that ilk, this is a good one. The accounts of near drowning (and drowning) in silt-filled water thousands of feet below the surface gave me nightmares.