Thank you again for your fast support all the time. Sadly that drawer didn't help too.
I think tunnels/tubes got bugged in RA2/YR cause nevertheless what I try, I dosn't work if the cliff is filled out.
With free space between the cliffs everything is working, but when I fill it with ground on the same height, than it won't work.
I extracted the coords from the drawer, even though I dosn't make a difference with the ones I get from the map editor.
Only thing with map editor is, that he spams -1, -1, -1, so you just remove it until you have 1 "-1" at the end of the coords.
But even with that in my "mapname.map" - file it don't work. He draws the lines, enter and exit, but the unit won't go through it.
(Picture 1 - This one works perfect)
If the tunnel line cells are on the same height as the ground, perfekt, Tunnel works like a dream.
(Picture 2 - dream looking, but dosn't work)
But when you use flatten ground to make it look like a mountain it wont work anymore.
So yeah, if maybe anyone else has solution for me, I would cry out of appreciation.
Greetings KazutoSensei