Octavius

The Octavius was a naval ship under the command of Captain Hendrick van der Heul, William Kidd's former quartermaster. The vessel became stuck in ice while it was looking for the Northwest Passage.

Ratonhnhaké:ton, a member of the Assassin Order, found the Octavius in the ice and entered it, looking for a piece of Kidd's map. After Ratonhnhaké:ton found it in Van der Heul's quarters, the ice cracked and the ship started its descent to sea bottom, though Ratonhnhaké:ton managed to escape.

Reference

• Assassin's Creed III