Diving Adventure, Paperback by Price, Willard, ISBN 1782950176, ISBN-13 9781782950172, Brand New, Free shipping in the US

'He left them there to die . . .'Hal and Roger Hunt dive straight into danger on a specimen-collecting trip to Undersea City. But it's not just sharks and killer whales the brothers have to fear when they are plunged into the depths of another adventure.