*personal refrences by Mr. Dipl.-HTL-Ing. Bernhard Höpperger

Train Tunnel

India - New BG Line Railway

Project 13 km

Subway

Austria - Wiener Linien U2

Stationen Pilgramgasse, Matzleindorfer

Platz, Rathaus, Reinprechtsdorferstraße,

Neubaugasse

Austria - Wiener Linien U5

Stationen Frankhplatz, Rathaus,

Volkstheater, Karlsplatz,

Museumsquartier

Road Tunnel

Austria - Arlbergtunnel 14,5 km

Austria - Gleinalmtunnel 8,3 km

Egypt - Ismailia Phase I 4,7 km

Germany - Engelbergtunnel 2,3 km

USA - SR710 North Study 4,9 mi (~7.8 km)*

Poland - Tunnel Drogowy 2,3 km

Sweden - Marieholmstunnel 500 m

Thermo- and Fluid Dynamics Consulting Engnineer e.U., Dipl.-HTL-Ing. Bernhard Hoepperger, Landesgericht Klagenfurt FN 436834 d, UID ATU 69706918