The BTS is a Specialist Knowledge Society of the Institution of Civil Engineers (ICE). With a current membership of 842 individual members and 74 corporate members, it is one of the most vibrant gatherings of professional tunnellers in the world.

Formed in 1971 to provide a forum for meetings  and discussion on tunnel-related matters, the BTS also publishes industry guidelines and codes of practice; conducts training courses to advance the education of tunnelling professionals; actively supports the recruitment of young people to the industry; acknowledges excellence in tunnelling; sponsors and supports industry conferences; and advises Government and the general public on the tunnelling industry.