"Dug into the wall was a network of cliff-dwelling homes, rising several hundred feet up the wall." Book 1, Chap. 3, p. 26

"'We lost the first team because we were excited and proceeded without proper caution.'" Book 3, Chap. 10, p. 90

"The team had discovered signs of the previous party's passage-discarded items, boot tracks in the silt, scuffs on the rock-and were sticking close to their trail." Book 3, Chap. 11, p. 97

"Men and rock he could handle, but the creatures down here...first the squid trying to gnaw his arm off and now this monster..." Book 3, Chap. 13, p. 123

"The decapitated head of the former SEAL bumped to a stop a yard away, eyes staring up, snowflakes settling softly on the eyelashes." Book 3, Chap. 13, p. 133

"'We're in uncharted worlds down here. Carnivorous snails, whale-sized sharks, and now marsupial predators.'" Book 3, Chap. 17, p. 175

"Ben struggled in his sleep, knowing he was dreaming but...