Might take a while for infiltration level to go down, if its still high then do another investigation.
And yes, if you leave a wrecked UFO then the aliens can still infiltrate, though on a smaller scale. They destroy the UFO and then attempt to go the the nearest building(s). Also if aliens do beam down to a building and you take a long while to get there, then they can go and ifiltrate other buildings, they will also attempt to infiltrate other buildings if they manage to retreat from a battle.
However just because aliens enter some buildings doesnt mean they manage to infiltrate it, some aliens just seem to die, once had a small scout beaming down on a corporate HQ, after getting some other UFO wrecks and battling I came back and investigated, no aliens there, investigated all buildings nearby, no aliens. Also on the alien infiltration graph there were no aliens, so I think that mabye the building security force managed to subdue the aliens. (Or possibly no-one was actually in the scout, or mabye there were beaming somebody up???)
Cant remember the tech for large quantum lab, i think its Alien Engines, Energy and Navigation, possibly some UFO's as well. Dont know how youve managed to get to cloaking before getting the lab, you must have some really bad pyhscists.
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