Despite its unique size and location, the tunnel is "not of massive engineering significance", according to geo-technical engineer Prof David Richards from the University of Southampton.

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The software creates digital simulations that can replace or augment more expensive methods of designing and engineering vehicles, such as wind-tunnel testing of prototypes.

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He - if there was a crisis, like the Big Dig tunnel collapse, he took charge and understood all the intricacies of engineering and - better than probably a lot of engineering experts on it.

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Branagan has faced that kind of tunnel vision throughout his career, which began with an undergraduate degree in metallurgical engineering from Michigan Technological University in 1990.

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