[@Thundercrash] Depends on the level of the room. But like I said in the post, the room has technology provided by the government that can manipulate the room - that means there's more to the room than simple 'technology' and most definitely has science and superpowers behind the formula. 

Don't worry, nothing will grow to be this extent. The Red Level Room will be closed off for a bit. But I do not think knowing how exactly the rooms work right now is necessary. Suspending disbelief and entering the world of X-Men and Fantasy. Make up your own reason until you find out the true reasons. 

This was to only set a scene and test Lucas mentally, physically, and emotionally. The room itself isn't that important, it's what the room put Lucas through that matters.