Blackwall Tunnel from immigrants; the tunnel lining was manufactured in Glasgow, while the manual labour came from provincial England, particularly Yorkshire. The tunnel was officially opened by the Prince of Wales on 22 May 1897. The total cost of the tunnel was £1.4 M and 800 men were employed in its construction, during which seven deaths were recorded. The southern entrance gateway to the tunnel, also known as Southern Tunnel House, was designed by LCC architect Thomas Blashill and was built just before the tunnel was completed. It comprises two floors with an attic. Today the western bore is only used for
Channel Tunnel defence arguments had become less relevant due to the dominance of air power, and both the British and French governments supported technical and geological surveys. In 1958 the 1881 workings were cleared in preparation for a £100,000 geological survey by the Channel Tunnel Study Group. 30% of the funding came from the Channel Tunnel Co Ltd, the largest shareholder of which was the British Transport Commission, as successor to the South Eastern Railway. A detailed geological survey was carried out in 1964–65. Although the two countries agreed to build a tunnel in 1964, the phase 1 initial studies and signing