Zombie Spines are the spines of certain types of zombies that can be harvested in the Call of Duty: WWII Nazi Zombies map The Darkest Shore. They play an important role in the map's main easter egg quest.
The player can begin to harvest zombie spines once the player assembles the Ripsaw. With the Ripsaw, the player can perform an action similar to a Bayonet Charge, which acts as the weapon's heavy melee attack. Upon striking a zombie with this charge, the player can press the interaction button while in the middle of killing the zombie with the Ripsaw, which will pull out the zombie's spine. On it is a small Überschnalle battery, which will either be lit up or not. Obtaining a normal zombie spine with a lit up Überschnalle battery is key in upgrading the Ripsaw to fire its blades.
Once the player unlocks the storage room by opening the Corpse Gate and placing the Monk's head on a terminal on the left, the player can place zombie spines with lit up Überschnalle batteries into a bucket on the left, which will release a certain zombie depending on the zombie spine obtained.