Located in New Zealand, the Second Tailrace Tunnel was constructed to improve the efficiency of the Manapouri Power Station. This $212 million project enabled the generation of an additional 640 GWh a year without using more water – enough electricity to power about 64,000 homes for a year.
The 75th Anniversary Selatin Tunnel was the longest tunnel in Turkey when it was completed. Its twin bores are 3,018 m and 3,043 m long, 12 m wide and 4.80 m high, and carry three lanes of traffic in both directions.
As part of the Manapouri Second Tailrace project, DCII was committed to protecting the fragile marine ecosystem at Deep Cove. The Deep Cove portal, which provided construction access to the project, was 43m below sea level and required both a sheet pile coffer dam and deep well pumping system.