The Brunels' Tunnel, a book celebrating construction of the Thames Tunnel, is published this month. Completed by Marc and Isambard Kingdom Brunel in 1843, it was the only project father and son worked on together. GE has five copies to give away. For a chance to win one, email your answer to the question below to damon.schunmann@emap. com.
Winners will be the senders of the first five correct responses drawn from GE's stovepipe hat on 19 June.
The deputy editor's decision will be final.
Q: The Thames Tunnel saw the world's first use of which tunnelling technique?
The Brunels' Tunnel (ISBN 09504361-2-7) is published by the Brunel Museum, £5 plus p&p; www. brunel-museum. org. uk; tel: 020 7231 3840.
It is also available from the Science Museum, the National Maritime Museum and the Museum of London.