Same crashing issue here, reproducible also. The difference I made is that I decided this time to fight against Arhu's roboter and destroyed it.
Nothern entrance of the tunnel doesn't work for me aswell, same with the crash in the area of the front entrance.
If necessary I can provide the savegame + crashlog aswell. Btw it's the first and only time the beta crashed for me. Completed everything which was possible I think...
