At the end of the game, after the protagonist accepts the mission "Assault Capital Prime", Norbu can be overheard discussing rumors about something under the Authority control that's supposedly over sixty feet tall, though he thinks it can't possibly be real.
“Well, that is troubling news, but I can't believe its that big!”
―Norbu, commenting on the rumors of giant mutant
“Oh my friend, you would think Im crazy if I told you. Best not to say anything.”
―Norbu, to the protagonist
“My muscles and joints getting old. Making it harder and harder for me to walk around these days. But I heard of a plant called Comet Bloom. I hear chewing it makes the pain go away. Trouble is, I aint got no way of getting it; the stuff grows near impact craters like those way North of here in Gearhead territory.”