Deep inside the base of the Land of Sound, there is a dark room with dim lights that keeps a bath house. Showers and hot springs are included. The bath is surrounded by snake's like scenery with hot purple colored water that represents the name Venom. The water is hot pure water so its not contaminated with anything. The dim lights is what makes the water purple. This is where Orochimaru and his pupil usually takes their bath to relax, and regain their chakra.