1933, but it was decided to leave the name of the company unchanged. In 1935, David Anderson attended the opening ceremony of the Moscow Metro, which the firm had provided advice to as far back as 1912. Other works in this period included Lots Road power station and construction of escalator tunnels in London Underground stations. Both founding partners died in 1938. Normal construction work mostly stopped in September 1939, and during the wartime years MHA acted as engineer for the construction of five of the ten London deep-level shelters, for the construction of armaments factories and for the repair of bomb damage on various British bridges, tunnels and docks. MHA also oversaw the conversion of the unfinished Central line tunnels to aircraft components factories. After World War II In the late 1940s, MHA designed road, pedestrian and cycle tunnels under the River Tyne (Tyne Tunnel) though the road tunnel was not built until the 1960s. Further commissions for road tunnels were received for the revitalised Dartford tunnel in 1956, Mersey Kingsway tunnel in 1966, Blackwall southbound tunnel in 1967, second Dartford tunnel in 1972, and the Hatfield, Bell Common, Holmesdale and Penmaenbach tunnels in the 1980s. In all, MHA were involved in the construction of all but five of the UK's longest road tunnels (the exceptions being the Heathrow Cargo Tunnel, Heathrow Main Tunnel, Clyde Tunnel, Limehouse Link tunnel and Rotherhithe Tunnel). In the same period, MHA worked with Freeman Fox & Partners to design the Forth Road Bridge and the Severn Bridge. Other bridge commissions in this period include the Tamar Bridge located next to Brunel's 1859 Royal Albert Bridge, the Kuala Lepar bridge across the Pahang River in Malaysia and the new London Bridge (including the removal of Rennie's 1831 bridge and its reconstruction in Arizona). When work began on London Underground's Victoria line in the early 1960s, responsibility for the tunnelling works was split between Mott, Hay and Anderson and Sir William Halcrow and Partners, each acting as Engineer for approximately half the length of the line. MHA partner John Bartlett patented the bentonite-slurry shield tunnel boring machine (UK patent 1083322) and a trial length of tunnel was drilled successfully through poor ground conditions at New Cross in London. The slurry shield design paved the way for the earth pressure balance TBM commonly used today. Modern times In the early 1970s, an alliance was formed with