Nautilus

The Nautilus was a submarine constructed by Cameron Amherst, a former captain of the Royal Navy who had been kicked out of the Navy for insubordination for claiming the Admiralty were fools because they refused to live in the future to the newspapers.

At some point, Amherst, who already came up with propulsion methods far ahead of their time, came up with a propulsion method for a submarine, and he befriended the French author Jules Verne and described the propulsion system. Later Amherst and a crew of professional seamen who weren't bound by family constructed a submarine, that Amherst named the Nautilus. At some point in Amherst's time as the captain of the Nautilus, he found his old friend Verne, and invited the author onboard.

Verne stayed on the submarine for a few weeks and studied the vessel, and then went on to write his legendary novel 20,000 leagues under the Sea and depicted Amherst as Captain Nemo.

The Nautilus travelled the seas for forty years, with Amherst visiting sunken ships and recovering old and forgotten treasures. But during those years the Nautilus was responsible for the sinking of several ships, most of them were British warships.

One by one, the Nautilus crew began to die, leaving only Amherst alive. Knowing he was going to die soon, he sent a letter to his old friend Jules Verne and told him he was going to entomb the Nautilus in a cavern located on the Hudson river.

The Nautilus was later discovered to be powered by a primitive magnetohydrodynamic engine, which Dirk Pitt realised was the source of the revolutionary engine of the liner The Emerald Dolphin.