Use several grenades to blow the door near where they are. You need the rifle with the underslung grenade launcher and at least 5 grenades for each door. Both can be aquired from the equipment locker in Mission Operations.
- Carla Croft is in Mission Operations. Blow the door between where she is sitting and the Cockpit.
- Luca Turel is in Global Operations by the door to the Lounge. He's literally standing right in front of the door you need to attack.
- Steve MacKai is in the hallway between Mission Operations and the Cabins on either side. Note: He can't be dead before the traitor attacks.