Ever wondered what it's like to dive to 100 meters, to be waiting alone in the dark, your only way back to safety a thin nylon line snaking away from you, up and up and up into the darkness and down and down and down into the blackness. Not a sound but your own breathing. Minutes ticking away how long you can wait for your friend. This book tells the story of more than 12 years of extreme deep cave diving, culminating in the setting of four Guinness Book of records for deep diving around the world.