'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.

'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.