Black Ops 4's developers couldn't resist including the Element 115 reference -- and you can find it in Blackout.
For those not in the know, Element 115 is an element discovered by Dr. Ludvig Maxis for the purpose of creating zombie soldiers. First appearing in Call of Duty: World at War, Maxis is the main antagonist in the series' many zombie modes.
You can find this Easter egg in the Factory facility in Blackout. You will see the 115 number on the board inside one of the buildings. But this is not the only reference in Black Ops 4.
If you go to Nuketown Island, you will see a wall clock showing exactly 1:15 inside one of the houses.
This is a fun little shout out to all the long-time fans of the Call of Duty series from Treyarch.
Those are all of the best Easter eggs in Call of Duty: Black Ops 4, and for other related articles at GameSkinny, take a look at the list below: