: Activate a pickaxe and use the {{key|RMB}} on the rock or cliff, select '''Mining''' > '''Tunnel'''.
After 51 about 50 tunnelling actions the message ''You will soon create an entrance'' will appear. A few actions later an entrance will be created, the exact number of actions is random; averaging around 5 mining actions after the message first appears.
* Tunnels can not be opened if the north-west corner is more than 4 dirts below [[Water#Water level|water level]].