Iceland Tunnels
There are eight open tunnels in Iceland, and three others currently under construction in the Icelandic road system. Tunnels in Iceland are usually built under mountains to prevent winter isolation of remote communities which would otherwise have to depend on high roads that often closed due to snow, to shorten distance between communities, and to increase road safety by bypassing dangerous stretches of road. A tunnel under a fjord, the Hvalfjörður Tunnel, is among the longest underwater road tunnels in the world, and goes as deep as 165 m (541 ft) below sea level.For more information watch this film
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