I meant the long indestructible pipe ducts inside tunnels, those which you hit if you don't align correctly while flying between them. The last pipe corridor expecially is pretty bad and there's few space available.
Anyway I finally managed to escape in one piece. I had to set 100+ speed to make it. There's a tunnel part whith obstacles which cannot be reached until you destroy the reactor though.
Phew.. also the lens is gone (what an useless objective)
Well, apart for this level.. I love this game
Thank you Wildstar and Keyan. Goodbye