1. Turn power on

2. In the power room, turn the steering wheel twice to the right (5 pm)

3. In the power room, interact 1 TIME with the 1st lever from the left
interact 3 TIMES with the 3rd lever.

4. Travel to the PhD flopper area and interact with the METAL DOOR by using your knife on it.

5. After the dialogue, go upstairs, to where PhD flopper perk machine is, collect the fuse in 1 of the
3 possible locations: on the desk, next to a locker or on top of a table next to the perk machine.

6. Insert the fuse in the fuse box next to the METAL DOOR.

7. After the dialogue, you'll have to throw grenades at 4 different generators with a shining red light on them, here are the locations: #1 in the METAL DOOR room, #2 by the MPL wallbuy, outside of the map, #3 in the shortcut connecting the second half of the ship to the spawn, #4 in the stamin-up area.

8. Head back to the METAL DOOR and interact it with your knife.

9. [CO-OP ONLY] Look for a vodka bottle in a clump of ice hanging off 4 possible locations: On the railing above the staircase that leads to PhD Flopper
On the railing above the staircase towards the AK-74u
On a railing near the M16 on the ship
On the ledge that connects both ships (near the MP40)

10. With the vodka bottle, interact with the pipe on the left of the METAL DOOR.

11. Activate 4 morse code radios IN ORDER at these locations: #1 in the room next to the M16
weapon buy, #2 in the stamin-up perk area, in a corner, #3 next to the MP40 weapon, next to the
Gumball machine. #4 in the METAL DOOR area, on top of a locker.

12. Interact with 4 Fog Horns in this order: #1 in the AK-74u area next to the WATER, #2 in the
Speed Cola area, closest to the perk machine, #3 next to the AK-74u weapon buy & #4 in the
Speed Cola perk machine area, next to the rock in the middle.

13. Find 4 Numbers with colors at these locations:
[PURPLE] In the Double Tap area, on the floor, surrounded by a lifesaver.
[YELLOW] On the floor, in the Jugger-Nog area.
[ORANGE] On the floor, in the back of the Stamin-Up room.
[BLUE] On the second floor of the Lighthouse, next to the blue dial.

14. Travel to the very top of the inside of the Lighthouse and turn the color dials in this order:
Turn yellow to its number
Turn purple to its number
Turn blue to its number
Turn Orange to its number
Turn purple to its number.

15. Acquire the V-R11 weapon from the random Mystery Box (random weapon box)

16. Use the V-R11 on a zombie inside the lighthouse and kill him as he's going up in the middle of the lighthouse. Acquire the golden rod from the center of the lighthouse.

17. Deliver the Golden Rod to the characters behind the METAL DOOR and wait for the dialogue to be done.

18. After Richtofen requests you to help them again, use your KNIFE on the fuse box and the door will open.

The End!

FULL VIDEO GUIDE: https://youtu.be/tEEYILCUY0w