Viking ships
The Skuldelev ships are five original Viking ships recovered from the waterway of Peberrenden at , north of Roskilde in Denmark. In 1962, the remains of the submerged ships were excavated in the course of four months. The recovered pieces constitute five types of Viking ships and have all been dated to the 11th century. They were allegedly sunk to prevent attacks from the sea. When the remains were unearthed, they were thought to comprise six ships, but "Skuldelev 2" and "Skuldelev 4" were later discovered to be parts of one ship.