on magma - how exactly do i find it >.>
For the moment, i generally stop going down once I hit the first cave layer, and then wall myself in..
And by that, I've never actually come across magma. I do understand the general principals of screw pumps ect, so I believe setting up a complicated flooding system should be fairly simple (i think I could design a fairly simple method of flooding an entrance hall with water, then unflooding it based on high water levels, but id have to put it into practice to make sure it works)
Of course, magma would be more fun, but as above :\