Ararat

The Ararat was the ship of Captain Johne and his whole pride. However, one day a Whirlpool swallowed his ship and deployed it on an island in the Underworld beneath the Dungeon Despise.

Much later, in Ultima V, the Avatar found Captain Johne there in the wreck of the ship. Johne told the Avatar the story of how the three shards of the Gem of Immortality had driven him insane, making him kill his three friends. From their bodies the Shadowlords arose. The Avatar rescued Johne and the Ararat was left behind.

In the following collapse of the Underworld, the wreck was destroyed.

Trivia

 * Funny enough, even though it is a wrecked ship they got lazy and used the keep-icon for it on the map.