Dumbledore Finds Lord Voldemort's Boat Hidden by Magic
Pages 563-565
Dumbledore uses his magical knowledge to locate an invisible chain at the water's edge. He pulls the chain, summoning a small boat that Lord Voldemort had hidden to cross the lake. Dumbledore explains that the boat was designed to allow Lord Voldemort or someone powerful enough to retrieve the Horcrux, while likely preventing others from doing so.
