And I went to see one of these experiments, and this is actually — you can barely see it, and the reason for that is it's entirely dark in there — this is a cavern that was left behind by the miners who left this mine in 1960.
Fui a ver uno de estos experimentos... en realidad esto es... apenas puede verse, esto se debe a que allí está todo oscuro. Es una caverna de mineros abandonada que dejaron esta mina en 1960.