At least it s a different (and better) tunnelling method than the one used previously at Heathrow:
http://www.cnplus.co.uk/news/judge-attacks-balfour-beatty-and-geoconsult-over-tunnel-collapse-disaster-why-were-the-warnings-not-heeded-heathrow-disgrace/913351.article
@mespilus started
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At least it s a different (and better) tunnelling method than the one used previously at Heathrow:
http://www.cnplus.co.uk/news/judge-attacks-balfour-beatty-and-geoconsult-over-tunnel-collapse-disaster-why-were-the-warnings-not-heeded-heathrow-disgrace/913351.article