Belyayev then deployed and pressurized the Volga inflatable airlock. Stone enters the space station via the airlock of the Pirs Docking Compartment. The Voskhod 3KD spacecraft had an inflatable airlock extended in orbit. Astronauts entered the Spacelab module through a or tunnel that connected to the airlock. Padalka and Fincke began the spacewalk at 16&colon;43 GMT, after emerging from the Pirs airlock. The airlock was jettisoned after use. Roslin orders Colonel Tigh to jettison Baltar out of an airlock. Additionally, each orbiter was originally installed with an internal airlock in the mid-deck. After use, the airlock was jettisoned. An airlock allows access to the chamber. Astronauts Wolf and Marshburn began EVA 2 at 15&colon;27 UTC out of the Quest airlock. The module featured a large airlock with a one-metre hatch. Searle releases the airlock and the three crew members rocket into space. Thus a submarine torpedo tube operates on the principle of an airlock. The player then battles an Alien queen, defeating it by expelling it through the airlock.