 The Fortress of Mimoyecques is the modern name for a Second World War underground military complex built by the forces of Nazi Germany between 1943 and 1944 . It was intended to house a battery of V @-@ 3 cannons aimed at London , 165 kilometres ( 103 mi ) away . Originally codenamed Wiese ( " Meadow " ) or Bauvorhaben 711 ( " Building Project 711 " ), it was renamed Mimoyecques ( " My Little Yokes " ) after the village in which it was located. sierpniu 1944 ( " August 1944 " ).
The 24-metre ( 79 ft