Getting to the Blue Key Slot (7)

As you exit the washroom and enter the Crew Quarters area, you will be attacked by Enforcers and Slimers.

A vent on the wall will have Slimers oozing out, and a Sentry Drone will attack. You can jump into this vent to find Devastator Ammo.

Note that some walls in the vents have been lifted, allowing you to return to the central convergence.

Cross the bridge, but be cautious as a Battlelord is around the corner. Defeat it, and Slimers will emerge from a vent containing shells and leading to an Atomic Health.

Enter the crew quarters proper, where Sentry Drones will attack. You can find RPG Ammo here.

In the sleeping areas, Enforcers and Troopers will attack. Enforcers will also spawn outside these rooms.

Search the lockers for a Laser Tripbomb and Body Armor.

At the end of the room, a Chaingun Cannon is on a shelf, with Chaingun Cannon Ammo and a Large Medikit in compartments on either side.

In the left bedroom, find Freezer Ammo and a Small Medikit. Cracks in the wall here do not lead anywhere.

In the right room, find Pipebombs and two Large Medikits.

A shaft leads down into the sewers. Press the switch to create a pathway with two walls; you must run across quickly.

SECRET 1: At the sewer entrance, hit the switch and go left to a small room with Shotgun Shells and a Large Medikit.

While the walls are back in their default position, face the danger sign and go to the left corner of this room. Open the wall to find two Atomic Health items, counting as a secret.

Return to the room with the Shotgun Shells; a switch here reopens the large walls.

Exit the vent and fight the trooper on your platform. You will be fired on by a Mounted Gun and Troopers on a lower platform.

Take them out. RPG Ammo is on this platform.

If you fall into the chasm without killing yourself (via Jetpack), another Jetpack is located at the bottom.

SECRET 2: Interact with the right of two computers to open a secret room containing Chaingun Cannon Ammo and a Large Medikit.

SECRET 3: Jetpack to the ventilation shaft with a hole in it. Land on it and face one side of the wall it's attached to; a cave in the wall contains RPG Ammo, Body Armor, and Atomic Health.

SECRET 4: Go to the computer where Secret 2 was found, jump off the ledge, and use your Jetpack. A cave in the wall contains Shrink Ray Ammo and, further in, a Shrink Ray.

Upon acquiring the Shrink Ray, three Octabrains will spawn. You can open the back of this cave to reach a Teleport Pad leading to a small room to avoid fighting them. A switch in this room opens a door, placing you on the platform opposite where you started.