Pick their brains, while people may blow you off because of workload, try to learn as much as possible. Ask questions. If need be, ask some people to a bar and ask about stuff there.
Don’t be like the last couple of interns I dealt with. Show up, no drive.
One never asked questions, and ended up doing just the shipping and disposal stuff.
The other one, I didn’t really work with when she was an intern, before I started, but now on the monitoring desk. When she was an intern, never asked questions, just showed up and did home work. Issue was the Sr. Engineer wouldn’t hold her hand, and spoon feed,.