Robert Lochner (engineer) harbours to Franklin Roosevelt and Winston Churchill. The decision to go ahead was taken and full-scale trials of the floating breakwater started in April 1944. During the trial, an onshore gale produced heavy seas, but Robert's bombardons calmed the waves effectively. Assembling two Mulberry Harbours the day after the landings on 7 June 1944 was one of the most remarkable engineering feats in history. A total of 1,500,000 tons of harbour equipment had to be taken across the channel in an operation involving 150 Allied tugs, and by D-Day 'plus 12', most of Lochner's concrete breakwaters were in position. On
Sark during the German occupation of the Channel Islands Guernsey team was discovered and the baker was “interviewed” by the Wehrmacht Feldgendarmerie until unconscious, but did not reveal his accomplices. He received a sentence of six months in prison, later reduced on appeal to four months. He survived, but two of the GUNS team died in prison. The night of 5–6 June 1944 was full of engine noises as American planes carrying paratroopers passed overhead. People listened to their crystal sets next day for news. By 22 June Americans were on the French coast just away. Three recovered 8.8 cm SK C/35 naval guns were emplaced in Little Sark