Olaf this is the files you need.
tunnel files
It looks like at 35248/89B0 to 35255/89B7 the hex codes are changed from CD to 00.
Blade mentioned that you made a change to the editor to accommodate the bridges. Is this it?
Banshee I am starting to get a handle on how the file work. If you are interested but Olaf most likely has all the note needed on it.