The longest land tunnel in the world , the LÃ tschberg Base Tunnel , will soon be working , in late 2007 perhaps , connecting by rail the town of Frutigen in canton Bern , with the town of Visp in canton Valais\/Wallis . The longest land tunnel in the world , the LÃ tschberg Base Tunnel , is in operation since late 2007 , connecting by rail the town of Frutigen in canton Bern , with the town of Visp in canton Valais\/Wallis .