Top 5 Largest Tunnels of the World

Delaware Aqueduct (1945)

Delaware-Aqueduct

Delaware Aqueduct was constructed in 1945 to supply water from Rondout Reservoir to Hillview_Reservoir in New York City. Its 137,000 m length makes it world’s longest tunnel. Sixty four year old tunnel is facing huge leakage problem. Up to 20 to 35 million gallons water leak out every single day out of total 1.3 billion gallons. Continue reading