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Huge concrete banks encircling a rough concrete floor, flyout into an extension sort of think. Bank to vert transition makes airing out possible. Ghetto quickmix concrete lip on the hip. Two small hips either end of the extension. Illegal to be in there but if you're quiet you'll be right (no one works there it's been shut for years). Bring spare tubes and band-aids cause it's gonna fuck you up if you fall.
Park off of Muslin Rise, find the cage fence next to the back of a house. Hole is pretty close to the start of the fence, easy to fit bikes through.