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« on: July 02, 2013, 08:26:54 am »
I make a regular habit of locating all three caverns and the magma sea before the end of the first summer, so I think I can add tuppance to this!
What I do is dig four pilot staircases, deeeeep down. I space them out about 20-30 blocks from my inital all purpous store room underground, for each major compass point. I usually keep going with the first tunnel until I hit magma, sealing up and diverting as needs be when I hit the caverns. Uncovering part of one can usually help me dig the others.
It might take a while depending on how many miners you have. I usually start with two and get more from immigration.
The most important step for *any* cavern exploration is -seal it back up afterwards-.
You can perminantly spy on a portion of the cavern once you've punched through the wall or the roof. Just remove the last up stair (z) and build a wall on top of the remaining downstair. You will need to make another 2 level staircase to let your miner out and your mason in. But this seals the hole. I found out the hard way that leaving these open is an invitation for any flying, firebreathing forgotten beast otherwise.