Aliens: Fireteam Elite/Extract

Part 1 - Flooding
You have managed to rescue Dr. Koenikker, and now need to escort him to the dropship. He is controlled by the AI, and is equipped with a handgun, providing only nominal assistance during battle. If looking for intel, there is some behind the elevator you ascended. Follow the mission marker ahead.

The doors lead to a flooded reactor core, and a walkway to the right. Xenos will make one wave from the front as you go through the walkway.

This leads to a junction. From here, xenos make a first wave from ahead, followed by two flanking waves.

The mission marker leads to a staircase heading downward. However, the flooding has spread through more of the station, thus requiring a diversion through waste processing.

Part 2 - Waste processing
The waste processing area is only a single room, but the direct routes are blocked. Drop down to the right, and there will be the first wave of xenos approaching. Turn left and ascend the stairs.

Part 3 - The locked door
The next room has a locked door, and requires a generator to be turned on. There is also an ammo crate and medikits. Turning on the generator will cause several waves to approach, and they will arrive from the three catwalks.

Even when power gets restored, the door is still locked. This requries finding the marked synth to download the necesary cipher key.

Part 4 - Pipes
The next room has Xenos climing up the pipes to attack, but it is a two-pronged attack as you will also be attacked from the right at the same time.

Part 5 - The cipher
A large room with an ammo crate. There is a moderate wave attacking from the far side of the room. When the wave calms down, it's discovered there's another locked door. The various synths in the room may have a cipher key, but only one randomly selected one has it. Additionally, there will be a slow pace of xenos attacking while searching for the key.

Past the door is a small flooded section.

Part 6 - Beltway
The beltway is getting close to the hanger, but there's still a bit more to go. There's an ambush that appears when about half-way down the corridor.

Part 7 - Hanger Delta
Hanger Delta has a company ship, and it needs to be investigated. This discovered that the company is transporting xeno eggs to and from the station, as part of their operations.

Aside from a potential hidden cache, the room is empty. However, the corridor leading to Epsilon has a small group.

Part 8 - Hanger Epsilon
The hanger has your extraction ship, but there's an issue with the hanger's automated system. You will need to prepare for battle, as the aliens will attack in an extremely large wave and have multiple approaches between the shipping containers. There are also supply crates and ammo. When you're ready, interact with the panel to start the first launch step and seal the HVAC ducts.

The attacks will generally head towards the ramp leading towards the ship, and across the right-hand railing. It's best to hold position on the ship platform, as that allows moving to cover the major approach routes. Eventually, the team will need to handle one of three tasks, as identified by the objective marker. The first is to pressurize the hydraulics, reached by taking the stairs to the left or right of the shipping containers below the hanger deck. This will also cause a Xenomorph warrior to attack.

After another moment of defense, you're sent to unlock the main bay doors, reached on the left. This will have another xenomorph warrior.

The final step is to signal clear for launch. Once active, run to the shuttle, as there will be three xenomorph warriors attacking at once.

Hidden cache locations
The hidden cache may be found in any of the following locations
 * 1) The hidden cache may be found in waste processing, by crossing the bridge before exiting the room.
 * 2) After waste processing and going through the door, turn right, then right again.
 * 3) In the generator room, the create is located behind the corner to the right of the generator.
 * 4) Claimed to be to the right of the door exiting the generator room. (unconfirmed)
 * 5) In the area searching for the synth door code, it is to the right, inside a doorway.
 * 6) Upon entering the beltway, on the lower section on the left.
 * 7) In hanger delta, up the stairs leading to the flight control.
 * 8) In the corridor between hanger delta and epsilon, in the darkened right-hand part of the tunnel.