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It is mainly of horseshoe section, with a maximum diameter of 15 feet 4 inches (4.67 m), and was driven from four faces. [17] At the Loch Lomond end, it splits into two steel lined tunnels, of 10 feet (3.0 m) diameter, and then as it emerges from the mountain, splits again into four 7-foot (2.1 m) diameter pipes, which enter the valve house.
Saint Olaf's church, 123.7 m (406 ft) (was thought to be 159 m (522 ft) in the 16th century, but more recent research suggest this is unlikely) Swissotel Tallinn , 117 m (384 ft) Radisson SAS Hotel , 103 m (338 ft)