The Fek'lhr
Avoid the booby trap on the floor right at the start of this mission. Take the keycard from the Klingon. Open the door to get the boom and open all transporters. Go back to the area where you started and use the elevator. Head through the unlocked door, then the next door you see. Pick up the palm print and go to the transporter room. Transport repeatedly until you end up in a room with three doors. Go through the door on the left. Pick up the vac suit and mag boots. Leave the room and go left for the second boom. Return to the room with three doors and head through the door opposite the transporter. Go left and into the locked door for the third boom. The mission is complete.
The Kor-van
Go through the first door after you exit the transporter room. Now walk into the torpedo room to find the pass-card. Kill the enemies in the engine room and then head into the room behind it to get level-2 access. Deactivate the force fields in the engineering room and make your way to the secondary helm. Return to the engineering room and go through the newly opened door. Put on the vac suit and mag boots and go out the first door on the left; you are now in space. Go through the airlock on the top left side of the spaceship. Use the grenade launcher on the boss here to finish the level.
The Crew Complex
Go into the guard house at the end of the caverns and walk left until you come to a door on the right. Walk inside and then open the door in the corner of the room to get the locker keycard. Go through the locked door and up the lift. Crawl underneath the blocked doorway at the end of the walkway to get the cipher key. Go through the cipher door after turning off the force field. Kill the enemies in the passageway and go into the room at the end to take the print key. Go through the palm door and lower the bridge. Walk through the door on the right and flip the switch next to the transporter. Walk through the door you just opened to finish the mission.
The Truth
This mission may be small but it provides a large challenge. You must fight both of the Duras sisters at once. First, kill the two Nausicans throwing grenades at you; they are easy to kill and will cut your enemy count in half straight away. As for the sisters, focus on only one of them. Shoot spin discs at her and detonate them as they get close. Fire three or four of these and she will surrender, completing the mission.