Tunnels
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| Flag: | Tunnels |
| File(s): | Terrain Control INI |
| Values: | Unsigned integers: All non-negative whole numbers from 0 to either 32767, 2147483647 or 4294967295. (Limited to: Tile set numbers) |
| Applicable to: | General |
Specifies the default tunnel tile set. The only effect this flag has is that the game force-creates a one-cell tube for any of the cells in the tiles in this set that contain the tunnel land type and have no associated tube in the map. In practice, this makes the tunnel display the "Enter" cursor when hovered over even if the tunnel doesn't actually lead anywhere nor can units enter it.
Compare with TrackTunnels, DirtTunnels, and DirtTrackTunnels. Each of these four entries has the same effect, i.e. the difference between the flags is purely semantic.
Despite there being a special entry for each tunnel set which each contain only 4 corresponding entrances, there can in fact be more than four pieces per section up to the practical limit of 99. In other words, each of these entries could potentially have a limit of 24 full sets of tunnel entrances each.