Shuttle bay door

The shuttle bay door is a force field that controls Dropships' access to the shuttle bay of a large Covenant ship, such as the Truth and Reconciliation. It is likely that this mechanism also keeps the shuttle bays air-tight.

In Halo: Combat Evolved, it is possible to operate the shuttle bay doors. On the level Truth and Reconciliation, the player is able to access the doors by heading to the third floor of the Shuttle Bay and pressing X on the control panel. This is required to complete the mission, so you can escape in a Spirit with Keyes.