Patrick Morris, of the Friends of Cromford Canal, said only a small section of the tunnel was accessible.

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He set about making a wind tunnel in his garage and placed small shields on toy school buses to test them.

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The tunnel closed in the 1960s because it was too small to allow the line to be electrified, he said.

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Before the experiment in the hanger could begin, researchers calculated the pressures the house would experience in a small-scale study conducted at the University's Boundary Layer Wind Tunnel Laboratory -- which has over 40 years of expertise testing high-rise buildings and bridges.

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There are many small cafes and restaurants on the way, but Marvelosa, just past the Chain bridge and the entrance to the tunnel on the right, serves excellent cakes and is unusually friendly for Budapest.

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There was no one else in the tunnel, which was whitewashed and warm, lit by low-wattage bulbs, and branched off into small closets and locked chambers full of brooms and mops and cleaning solutions.

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