I've read this somewhere else before, but I think it didn't get mentioned here on civfanatics yet. Also, I have extended it a bit:
Tunnels! How about building tunnels and canals? This could be useful in 2 situations:
- Sometimes if you play archipelago, and the islands are just one square away, divided by water, you still have to use a ship as a bridge to get your units from one island to another. Here the concept of a tunnel would be good, such as the one connecting Britain and France in RL. Tunnels shouldn't be longer then 2 squares (not sure how "long" a square translates into RL, but more then 2 seems to much). Tunnels could be bombarded and destroyed. A tunnel tile can be irrigated but not mined. They can also have a RR inside and any unit using RR can use them. Maybe with the invention of "Construction" this could be possible.
- Sometimes you are on a large continent that has one tile that seperates the oceans from each other. Usually you build a city there so that your ships can pass through instead of travelling the whole land mass. But sometimes it's not possible to settle down there as the surrounding terrain might be useless. So there you could build a canal now for ships to pass through. As above, you will need "Construction" and maybe also "Gunpowder" to blow up the terrain, and canals could als be bombarded. A canal would automatically include a drawbridge so that land units can still cross it, but not at the same time - if a ship is inside the canal, land units must wait until it moved, and vice versa.
Of course a simple city that just functions as a pass-through point will do the job, but let me have my moment of ideas please
This could be taken further into building an underground network using tunnels to infiltrate other civs from below, literally planting bombs under their cities (or maybe only going for their colony). This may only be done by special groups such as Guerillas, and only after "Espionage". Other civs may detect your tunnels by accident (e.g. building a mine over your tunnel) and you will loose rep points. Tunnels could be started anywhere and also be used as underground trading routes, in case your civ is divided by another nation in the middle.
The tunnels especially would give the game a whole new face concerning sneak attacks and trading. Tunnels could break down, killing everyone inside the specified tile (canals could be flooded in case Fireaxix decides to implement natural disaster, otherwise they would be stable).
Sounds too complicated? Just my rambling, sorry, I really want tunnels (at least to connect nearby islands). Carry on guys
