THE INSTANT NEW YORK TIMES BESTSELLERAn awe-inspiring portrait of the mysterious world beneath the waves, and the men and women who seek to uncover its secrets.______________________________________________'Masterful and mesmerizing . . . an irresistible mix of splendid scholarship, heart-stopping adventure writing, and vivid, visceral prose.' Sy Montgomery, author of Soul of an Octopus 'Fantastical and forbidding' Washington Post 'A fascinating history' Time'Casey's descriptions of the shimmeringly strange life teeming below the waves capture her wonder and ravishment in prose that morphs into poetry . . . Entralling' Boston GlobeFor all of human history, the deep ocean has been a source of fear and fascination, an unknowable realm that evokes a singular, compelling question: what's down there? But now cutting-edge technologies are allowing scientists and explorers to discover this strange and exotic underworld: a place of soaring mountains, smouldering volcanoes and valleys 7,000 fee