'You stand rooted to the spot or you run like mad' Hal and Roget Hunt head off for another challenging mission - this time to search for gorillas in the Congo jungle. But when the boys stumble across the evil trade in baby gorillas, someone seems determined to silence them once and for all.
Once again Hal & Roger Hunt are on board the Lively Lady, studying submarine life & searching for the treasure of the Santa Cruz which sank three centuries ago. But Skink is also on board & he will stop at nothing to get the treasure
'It's a lost world out there' Hal and Roger Hunt sink deep into danger when a specimen-collecting trip takes them into the lost world of the South Seas. But the deep-sea trawl has a hidden agenda - a top secret mission for Professor Stuyvesant, and his scientific experiments in Pearl Lagoon . . .
Teens Hal and Roger Hunt stay in Undersea City, 200' below Australia's Great Barrier Reef, to find rare species for dad's Long Island collection, and ways to produce food from sea. They face coral cuts, man-eating sharks, killer whales, giant squid, other dangers. When they find sunken treasure, villain Kaggs starts a landslide, proves deadlier than sea creatures.
