I know water elevators are old news, but they work so well in indev too. Alot of my builds are at the bottom of my map. Hopping up stairs can be a drag so I use elevators to get to the surface and added a quick drop shaft into the bottom pool for even faster entrance. Great to out smart the bad guys. If and when we can transport water, wow, no limits. Oh on the deeper shafts as somebody already has said, you will need to add breathing rooms on the way up.
quick ups, faster downs