Here's a 2014 example of the danger of visiting the lab:
I'm pretty sure that there are now at least 3 production lines at various scales ranging from gram to kilo scale. There were 2 labs with two production lines plus the most recent scaled-up production at the kilo-scale. These gram-scale production lines only require about 400 sq ft of space out of something like 10K square feet not including the new facility. The scaled-up production is not much larger than that: i.e. bigger vats (ml scale vs. liter scale).
Someone not having actually seen the labs might think otherwise.