The wooden nesting box was attached to a girder about six feet below the road bed.

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And an architect has ways to show us, if he wants, how that girder is at work.

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Constructed by Sir William Arrol, it is supported by 1000 ton counterweights and comprises three double cantilevers held together with girder spans.

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Kenneth Joyce, 53, of Lanchester, suffered fatal head and neck injuries in 2008 after falling to the ground when a girder struck the cherry picker in which he was standing.

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As the truck was entering the bridge, its load -- which Rudeen described as an equipment casing form for a drill rig -- hit a support girder, causing the bridge to collapse.

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He looked like a security guard in a suit and hi-viz gilet, but he unfurled a banner saying "Nuclear: wrong answer", and as he crawled along a high iron girder, the word "Greenpeace" was revealed on the back of his jacket.

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