Years ago I had an internship, in the lab there was a couple airgapped PCs with some confidential stuff on them, at least above my pay grade of $0. I was bored

Years ago I had an internship, in the lab there was a couple airgapped PCs with some confidential stuff on them, at least above my pay grade of $0. I was bored and tried logging with admin/admin and it worked, basically giving me root level access. I reported it, IT security interviewed me and I wasn't allowed near the PCs for the remainder of my internship.