As large as it appears on the surface, the complex appears to extend for miles underground. The lower levels are accessed by an elevator. There are berthing areas for the Saturday Sub and Airship. When the House's System is going on a reboot in Guess Who's Going To Be Dinner, it leaves Zak quite a pickle. It is barely seen throughout the series, since the Saturdays spend most of their time traveling the world in search of Cryptids.