filmed the hole tunnel in hamburg on the way back from vacation from baltic see. its quite long with 3300m and it goes down under the river elbe.
[video=youtube;u_79Ik3aZ_4]https://www.youtube.com/watch?v=u_79Ik3aZ_4[/video]
[video=youtube;u_79Ik3aZ_4]https://www.youtube.com/watch?v=u_79Ik3aZ_4[/video]