Following the events Jerry Mitchell encountered in Dangerous Ground, the pilot-turned-submarine officer is now a department head, the navigator, aboard USS Seawolf. Now on a mission deep in the Barents Sea, north of Russia, Seawolf explores the sea floor, part of a sophisticated reconnaissance plan that will watch the Russian navy as it trains for battle. Although well outside Russia's territorial waters, Seawolf is ambushed by Russia's newest submarine,...

Ty discovers an entire township chained to a sunken submarine, its inhabitants condemned to an icy underwater grave. It's only the first clue to a mystery that has claimed hundreds of lives and stands to claim two more, lives very precious to Ty and his Topsider ally, Gemma.

Kate Rule, a CIA analyst battles to force her superiors and the U.S against a Soviet KGB plot involving a Russian spymaster and a military base hidden on the coast of Latvia. Her quarry, General VIktor Majorov, seems to be planning something: a secret attack on Sweden from a nuclear submarine.

In the summer of 1851, with encouragement and ideas provided by his family, an inventor builds a working submarine and takes his family for a ride. Includes notes about Lodner Phillips, the real inventor on whom the story is based.

Thirteen year Sharkey and his people are "Sunkers", they are submarine dwellers who try to avoid the "ghosts", people who hunt and destroy all who use machines. When the last remaining Sunker mothership is destroyed, Sharkey must prove himself a true hero to help his people.

When the German submarine, U-471, collects two prisoners from a vessel located off the Icelandic coast, ordered to transport them to the base at Brest, one of the prisoners, a British submarine commander, goes rogue, setting in motion a series of shocking, brutal events that seem to be linked to the supernatural.

When deep-sea mining for gold and silver in the Pacific Ocean triggers a series of earthquakes, threatening a nearby island, Benji Franklin is called upon to use his amazing problem solving skills--and personal submarine--to stop the shaking and save the island's people from disaster.

The Secret Explorers jump into action to save a pod of humpback whales, but when Connor and Roshini's submarine malfunctions, the explorers could be the ones in trouble.