ISS supply vehicle production. Technicians working on a part of the European Space Agency's automated transfer vehicle (ATV). This ring lies between the pressurised and unpressurised cargo holds. It contains the refuelling ports (green) and reaction wheels (black) used to orient the spacecraft. The unmanned ATV will be used to send supplies, including water, air, propellant and food, to the International Space Station (ISS) from 2006. Once docked, the crew will be able to enter the pressurised cargo hold. Once emptied, the cargo hold will be filled with waste. After a stay of approximately six months it will detach from the station and head to Earth, burning up upon re- entering Earth's atmosphere.