For those who don't read the mods workshop thread, I've managed to modify the terrain in SH3, here is my version of the Kiel Canal, Scapa Flow Eastern entrance and the Suez canal. Install instructions are inside the zip file.
http://rapidshare.de/files/14120318/...n_mod.zip.html
Any problems or questions please post them in this thread :
http://www.subsim.com/phpBB/viewtopic.php?t=48760
Ref.