Build a secret vault

Build a secret vault
General: -1
The secret vault will help you organize your spying activities in a region.
| Duration | 00:01:15 | 
| Difficulty |  General - -1 | 
| Properties | BlockQueue | 
| Recipe |  | 
Result
| Name | Chances | Quantity | 
|  Secret vault | 100% | 1 | 
Components
| Name | Quantity | 
|  Vault | 4 | 
|  Stone wall | 4 | 
|  Stone foundation | 20 | 
|  Fortification | 4 | 
|  Spying Machine | 1 |