Sydney's Super Tunnel

Digging Deep (1x3)

Air date: Sep 02, 2020

Another super challenge looms, perhaps the greatest of the entire project: digging two tunnels beneath Sydney Harbour. In the early planning stages, the team actually considered dropping pre-fabricated tunnel sections down onto the floor of the harbour one by one, lowering them from barges, which was the way the road tunnel under the harbour was built.