The Chateau du Corell was Mr. Tunnels's huge mansion on Corellia. His hidden treasure vault was widely believed to be in the mansion itself but was actually under an old Corellian oak outside. However, his mansion was the location of his secret laboratory where he performed odd experiments. When Mr. Tunnels died, his heirs came to the Chateau for the reading of his will. There, a number of them were murdered by Herlock Sholmes. Zudu and Zorith discovered both the vault and the laboratory.