In his latest video, Tom Scott visits this unique ferry design in Denmark. The Udbyhøj Cable Ferry across Randers Fjord is a cable ferry in the sense that motors pull the ship along undersea guide cables back and forth between its destinations. But it's also a cable ferry in that it's powered by an electrical power cable that gradually unrolls on a drum mounted on the side of the ship.
The ship carries 70,000 people per year with an average of 88 trips per day. Occasionally, it must stop to slacken the guide cables and allow deep-keeled traffic to pass--as all cable ferries must. But the electrical cable just rolls up on the ship.