Building A Metro
August 24, 2010 by ivana
Filed under Interesting News
In St. Petersburg they have almost the deepest subway in the world, according to wikipedia: “The deepest metro system in the world was built in St. Petersburg, Russia. In this city, built in the marshland, stable soil starts more than 50 metres (160 ft) deep. Above that level the soil mostly consists of water-bearing finely [...]





