Go to the control, tell them you're a student, show them some
identification, school card or something, tell them why/what you
need to take pictures for. Write a simple memo, and sign off if
necessary for their retention.
You want to cover your backside, they want to cover theirs. They
cover theirs with paperwork, you do the same. Sounds stupid and
unnecessary, but you want things done, thats how you do it.