Tunnel-tube junction station

A tunnel-tube junction station was a large box-shaped unit that was primarily used at construction sites on airless planets. They were in use until a suitable underground tunnel system could be constructed. It was mounted on a tread system, for mobility, and housed four retractable tunnel-tubes. The station, with its self-propulsion unit, could be moved into position and the tubes extended to dock with another junction station, starship, or the hatch of an erected building. They also contained viewports and the main control console. The console controlled the propulsion unit and steering controls, also, commo and safety/alarm circuitry, along with lighting apparatus. Gravity-control systems and life support were also managed from the console. The junction station and tubes sometimes employed a hydroponics recycling system for breathing air, which was tied in to an established hydroponics layout on the site, and metered through the control console.

Appearances

 * Han Solo at Stars' End