First you will want to install this addon (you will need this to start the easter egg)
Day/Night Cycle (Industrial17) This addon is for industrial only. it will not work for any other map.

First when you load into the map you will want to go to the entrance of shell beach.
Then noclip up till you are on the train tracks

When you are done with that you will want to open the console then type dnc_settime 19:00

After you typed the command, look up in the sky to see if there is light like this

Now you are ready for the next part.

You will want to enter the building above the train tracks that looks likes this.

When you enter the building, you will see a sparking box on the wall. You will want to press "E" on it.


After you press E on it you will hear the combine shield going down and you can enter it. (btw the shield will stay open until someone enters it)

When the shield is open walk down the tunnel.

Then you will fall in a big hole that leads to a hallway.

When you walk down there you will start hearing weird sounds, And start to see the walls are shaking and creepy pictures flying past you. Then slowly the door will open, Then you walk in the dark room and hear some more weird sounds then you will see this

you will see that about 2 seconds then you teleport back to the train tracks

I hope you enjoyed this guide and helped you to find the egg.
If there are errors let me know so i can fix them

Have a good day and good bye