delivers fish to the Kunghit Island mine every week. During one such visit, Pitt is smuggled onto the island and given a tour of the mine by a disgruntled employee, who, Pitt finds out, is Clive Cussler. The mine has a revolutionary mining method in which high-powered soundwaves are used to dig through clay containing diamonds. Pitt learns that the Dorsetts have kidnapped both of Maeve's sons and are holding them hostage. The company security force captures Pitt as he leaves the island, but Broadmoor rescues him, and the two escape using jet skis. Soon after returning to the US, Pitt, Al and Maeve are sent to Wellington to board another research vessel, the Ocean Angler. Their mission is to covertly infiltrate Gladiator Island, find Maeve's sons, and bring everybody back to the vessel. However, the plan is derailed when the pickup car drives them to a Dorsett company warehouse instead of to the research vessel. After a failed escape attempt, they are all brought onto the Dorsett yacht and immediately put out to sea. After about a day, Pitt, Al and Maeve are abandoned in the southwest Pacific Ocean, in a small craft and far away from ordinary shipping routes; in addition, a tropical cyclone is quickly approaching. Meanwhile, the NUMA computer center in Washington discovers a way to predict the coming convergence zones, and in a few weeks the Hawaiian island of Oahu will be hit. The head of NUMA, Admiral James Sandecker, fails to convince the President of the looming threat, so he launches a clandestine operation to avert the disaster. The plan is to reflect the soundwaves from the convergence zone back towards Gladiator Island. A giant reflector is obtained from a government agency; it is dismantled, loaded onto the famous deep-sea recovery ship Glomar Explorer, and brought into the convergence zone. Pitt, Al, and Maeve have successfully endured the storm and finally stumbled upon a small island. Here they find the remains of a sailboat, which they use along with their own battered craft to build a small sailship. With this ship, they set course for Gladiator Island, planning to rescue Maeve's sons from her evil family. As they climb ashore, the sound reflector outside Oahu successfully reflects the high-powered soundwave toward Gladiator Island. At the same time, scientists realize that this could cause both volcanoes on the island to erupt. Admiral Sandecker is shocked