The UnderGround is the club house of Münchner Löwen Club e.V., the Munich leather and fetish association, on the Machtlfinger Straße in Obersendling. It runs to 400 square metres of play space on two levels: an SM area with a spanking rack and both a fixed and a revolving St Andrew's cross, cages, an iso-box, a well-equipped fist room, extensive bondage points, slings, a gynaecological chair, a wet area for water play, dark areas with glory holes, a large open play area and a locker room.

Entry no longer needs an advance online registration or a registration fee, and the club no longer records names. Admission is granted on an official identity card or passport, at a reduced rate for members showing a current membership card and at a lower rate again for guests up to 26. House rules and a disclaimer are posted at the box office and published on the association's own site.