Tunnels

Additional tunnels for mine.

Name	Costs
Tunnels	3600 3000 3200 1600	0	03d14h40m

Ability
Provides	Requires
+15% Resource production workforce - Iron Tunnels improvement	Building is Large Iron Mine User has Tunneling technology

Buildings to improve
Name	Construction Costs			Culture Points	Trade Points
Large Iron Mine	4200 3300 1700	0	07d15h20m	8	4

Tunnels techtree