by Kiwininja » Sat Jul 28, 2012 12:59 am
Going on the fact that you are probably using Voxel when you first start up the program the bottom layer(already there) is considered water and the lowest level you can go. One block level up from that is the "indestructable" layer (known as the bedrock layer to most minecraft players) and is the only level where if you place blocks then they can be broken in-game. Both of these can be considered the base of your map and will not allow players to go any further down. Hope this helps :D!
o.o {I will hide like no ninja has hidden before} o.o