Tunnelcraft Ltd is currently working for the BAM Nuttall. Morgan Sindall, Balfour Beatty joint venture who are constructing the 7km west section of the new 25km Thames Tideway Tunnel. Upon completion, the Thames Tideway Tunnel will the capital's sewage system is fit to support London's projected population for at least the next 100 years, and will tackle the issue of discharges of untreated sewage that currently enter the River Thames on a regular basis.