The Old Bunker
Blast doors, the Reactor Warden, and protecting yourself inside.
The Old Bunker lies 1200 to 2100 blocks outside the outer wall and never inside a city. It is built the first time a player comes within 200 blocks. Use the bunker compass to find it.
A half-buried outpost marks the entrance. Stairs lead down into three levels.
| Level | Rooms |
|---|---|
| 1 - Staff | Airlock, armory, dormitory, mess hall, med bay |
| 2 - Tests | Checkpoint, column hall, laboratory, generator room, arena, vault room |
| 3 - Core | Cell block, archive, cooling room, reactor, control room |
Blast doors
Every level is blocked by blast doors. A door opens once every trial spawner in front of it has been cleared. Standing in front of a closed door shows how many trial chambers are left.
| Door | Opens after |
|---|---|
| Level 1, before the stairs | 5 trial spawners in the armory, dormitory, mess hall and med bay |
| Level 2, before the arena | 4 trial spawners in the laboratory and the generator room |
| Level 2, before the vault room | 4 trial spawners in the arena |
| Level 3, before the reactor | 4 trial spawners in the cell block, archive and cooling room |
| Level 3, before the control room | Defeating the Reactor Warden |
Trial spawners drop trial keys that open the vaults on level 2. Trial spawners do not react to players in Creative mode.
The Reactor Warden
The final boss digs out of the ground when a player enters the reactor room.
| Property | Value |
|---|---|
| Health | 300 |
| Melee damage | 18 |
| Sonic boom | Disabled |
After it is defeated, the last door opens. Pull the lever in the control room to return to the elevator in the Overworld.
Protection
The whole bunker area is protected in Survival mode:
- Blocks cannot be broken or placed, except torches and lanterns
- Explosions do not destroy any blocks
- Ender pearls and chorus fruit do not work inside or into the bunker