Sydney's Super Tunnel Season 1 Episode 3
Watch Sydney's Super Tunnel Season 1 Episode 3 full movie online free in HD with English subtitles – no download needed.
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.