An underwater railway tunnel is now open between the eastern and western parts of Istanbul. The tunnel is the worlds first to connect two continents: travelling under the waters of the Bosphorus strait, it joins the Asian and European halves of Turkeys largest city together. Its also the worlds deepest underwater railway tunnel of its type, according to Turkish officials, sitting 190 feet (58 meters) below the surface of the Bosphorus. The BBC reports the project was first thought up by an Ottoman sultan in the 1860s, but received more timely backing from current prime minister Recep Tayyip Erdogan.
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