okay so ive been posting a good bit about this and im back with another consideration.........I want to dig a big hole around 16x18 and put a 12x14 sized room inside. this room needs to be waterproof to prevent humidity and mold AS MUCH AS POSSIBLE, just enough to not seap through I understand there will be some moisture(that's where dehumidifier comes in) room will have many layers of waterproofing materials, epoxys, seals, roofing, tileing, etc on the outside sealed all the way to prevent water from entering as much as possible. (then the extra space filled in with dirt).........but I found out this will not be enough to keep water and mold out so underneath the foundation, I will also install a sump pump in the very center of the hole and run it through pvc far away from the grow room hole, so most of the excess water will be drained away from the hole........on top of this a powerful dehumidifier will be ran in the room (and yes there will be venting)...........so what are anybodys thoughts on this? should it work good enough to prevent a lot of mold and most moisture? how to use the sump pump most effectively? anything else I should know?..........please do not comment if your going to bring up some totally irrelevant point about my idea, I promise its been brought up to me before and its being considered. I did not include every little portion of my plan because it would become a book(as if not long enough already)........oh and sorry for the long paragraph it wont let me break to the next line for some reason, look at the dotdotdots at a break in the paragraph.