update.
well after 14months of tinkering ive just about got it all sorted, have had a few average and a few heartbreaking grows but things are looking up now and starting to dial in
the main issues I encountered were humidity and... light leaks who woulda thought that with being burried but I overlooked it because I had it buried it couldnt leak light my mistake and cost me multiple hermie grows grrr.
if anyone is thinking of undertaking the task of an underground room then my advice is to think of EVERY scenario you may encounter and address it prior to burial. it sux to get the exavator back every few months for add ons
another thing to consider is location, it needs to be near enough to something to conceal the air intakes and outlets this has been the hardest thing to overcome but just takes a few joints and some Inginuity... the whole project does really and my biggest regret not doing so from the start.
containers make wicked grow rooms once setup well and mine is now fully self contained and totally undetectable
there have literaly been hundreds of unsuspecting people walking over and near and none the wiser !! no more worries with visitors and contractors turning up with no notice
