. . . "749 (Correct as of 2010)"@en . . "British Tunnelling Society"@en . . . "The British Tunnelling Society (BTS) was established in London, UK, in 1971 by tunnelling professionals. The BTS is a learned society of the Institution of Civil Engineers, its mission being to provide a forum for meetings and discussion on tunnel-related matters. The current chairman of the BTS, Roger Bridge, assumed the position in 2014."@en . . . .