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http://www.ice.org.uk/educationzone/undergraduates/rwce_tunnelling.asphttp://www.ice.org.uk/educationzone/undergraduates/rwce_tunnelling.asphttp://www.innovationandresearchfocus.org.uk/articles/html/issue_51/improving_quality_and_minimising_risk_in_ground_work_using_the_new_ags_-_M_modules.asphttp://news.bbc.co.uk/1/hi/business/the_company_file/280107.stmhttp://necatpace.org/mtphotos/gye012.jpg