Signs are easily the best thing in this game - so far I've named my two opposite tunnels HERP and DERP, thrown in a dx quote and was about to do another "Add laddergoat here" near my ladder when the server crashed. Or I lost connection at least.
This originally started as a 3x3 tunnel: Each picture in sequence is about 20secs run time down the tunnel. It's more than a minute long! I don't know how many blocks that is.
The trench down the middle was dug later and is about a dozen blocks deep: I wanted to flood that centre trench and be able to ride a boat up and down the underground river. Unfortunately: Minecraftian water won't cooperate with my plan. That's as much of the trench as I can flood, at least without digging dozens and dozens more bore holes down to feed into the river.
Every mine links to someone else's it seems... Would be awesome if everyone that has build access had their own area on the map with their own mine.. with like neverending supplies :p
every time i try to add on to my building so far, i run out and have to try and get more from my mine, but i seem to his other mines with torches everywhere lol