Tag der Toten
Blue Rock (Starting the EE)
To begin the Easter Egg, you must make it to the top floor of the lighthouse. This will trigger a dialogue with The Hermit. He will ask you to retrieve a blue rock from the cave.
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The rock can spawn in the cave shown below. There are multiple spawn locaations, but they are all within this small cave. It will be easy to spot.
You will need to knife or shoot the rock, then pick it up.

You must then bring the rock to The Hermit and place it on the dumbwaiter.
Power
There are 3 power switches throughout the map, whose locations are shown below.
On the ice in the spawn area
In the Bridge on the Sun Deck of the ship
In the human infusion room of the facility, to the right of the Samantha door
Zip Lines
In order to access the entire map, you will need to build some zip lines, as well as some "flingers" that will allow you to traverse the map more efficiently.

Click on the labels below to reveal the steps for each.
Zip Line Cranks
Zip Line Handle
You must find a zip line crank and place it on this box, located on the Sun Deck.
The possible locations of the crank are below.
On the Stern facing the golden PaP machine island
On the Stern facing the lighthouse
On the stern inside the small room by the zombie window
You must find another zip line crank and place it on this box, located on the Main Deck.
The possible locations of the crank are below.
On the Forecastle facing the golden PaP machine island
Behind you when facing the campfire with the pot
On the Forecastle near the zip leading to the lighthouse
After placing the cranks, you must hold the interact button on them until the zip line stops moving.
After you've placed both zip line cranks and moved the zip lines into position, the hermit will lower a zip line handle for you to pick up. This will allow you to travel on the zip line up to the facility.