Some tunnels open up into multiple other tunnels
Some tunnels are blocked, but can be fired upon to unblock them. The installation does not have any defenses or authority ships patroling it that could attack you in response.
The unauthorised installation in VESPER-M4. If you land on a landing pad you will fall through into a tunnel. Seems to be a visually a very pretty installation but I could not find any meaningful gameplay involving it, might be good for the destination of a Buckyball Race as there are lots of tunnels. When a door has a red triangle in the middle of it, you can shoot it to open it. When I first approached there were some other ships around but they did not seem to take any notice of me, they left after a while. There also some very aptmospheric sounds at the installation.