The 185th Tunnelling Company started work on the "Lochnagar" mine on 11 November 1915 and on 4 February, eighteen members of the 185th Tunnelling Company were killed in a German camouflet explosion at La Boisselle.
The 185th Tunnelling Company started work on the "Lochnagar" mine on 11 November 1915 and handed the tunnels over to 179th Tunnelling Company in March 1916. On 4 February, month before the handover, eighteen members of the 185th Tunnelling Company were killed in a German camouflet explosion at La Boisselle.