<P> A large mole was completed in 1947 at the San Francisco Naval Shipyard in the Bayview - Hunters Point neighborhood of San Francisco to accommodate the large Hunters Point gantry crane . The mole required 3,000,000 cubic yards (2,300,000 m) of fill . </P> <P> The two concrete moles protecting the outer harbour at Dunkirk played a significant part in the evacuation of British and French troops during World War II in May / June 1940 . The harbour had been made unusable by German bombing and it was clear that troops were not going to be taken directly off the beaches fast enough . Naval captain W.G. Tennant had been placed ashore to take charge of the navy shore parties and organise the evacuation . Tennant had what proved to be the highly successful idea of using the East Mole to take off troops . The moles had never been designed to dock ships, but despite this, the majority of troops rescued from Dunkirk were taken off in this way . </P> <P> The Churchill Barriers are a series of four causeways in the Orkney Islands with a total length of 1.5 miles (2.4 km). They link the Orkney Mainland in the north to the island of South Ronaldsay via Burray and the two smaller islands of Lamb Holm and Glimps Holm . </P> <P> The barriers were built in the 1940s as naval defences to protect the anchorage at Scapa Flow . They were commissioned following the sinking of HMS Royal Oak in 1939 by German U-boat U-47 which had penetrated the existing defences of sunken blockships and anti-submarine nets . The barriers now serve as road links, carrying the A961 road from Kirkwall to Burwick . </P>

In the movie dunkirk what was the mole