One of the most popular books on London (it has reprinted six times since it was first published in 1984) London under London has now been updated to take into account the latest subterranean developments. A new section covers: the pioneering deep level water main 80 kilometres in length, much longer even than the Channel Tunnel; new power tunnels and the enormous substation beneath Leicester Square; new underground railways; glass fibre communication; and much more. Clearly, metropolitan man is burrowing as actively as ever.