Bloodborne Wiki
Underground Cell Key
Underground Cell Key
Research Hall

The Underground Cell Key is a Key Item in Bloodborne's The Old Hunters DLC.


In-Game Description

Key to the cell below the Grand Cathedral.
Hunters are held within the underground cell, so that things better left unseen, better left unknown, will decay quietly in the fallow darkness.



Unlocks all of the cells in the Dungeon, with exception of the one that lies beneath.


  • Players can jump from atop the ladder that can be climbed, from the "Patient Room Floor 2", to reach the key without having to climb to the top of the Research Hall, and activating the lever that rotates the staircase. This allows earlier access to the above mentioned gear.
  • This item allows access to the Yamamura Set and the Church Pick. It also allows players to summon Yamamura the Wanderer later on if they equip the Impurity rune.
  • It is one of the two keys that unlock cells in the dungeon. The other is the Underground Cell Inner Chamber Key.


  • Like the Balcony Key, this too is a very stubby key, and is the only other one like it.