During the
Second World War the village became part of the secret
Mulberry Harbour project in preparation for
D-Day. The profile of the beach and sea bed at Garlieston was similar to that of the proposed harbour sites in
Normandy and that, coupled with the remote nature of the locality, led to Garlieston and the surrounding area being selected as the development region for the artificial harbours. Prototypes of three designs were trialled in Garlieston Harbour and at nearby Rigg Bay and Portyerrock. A concrete caisson (code-named
Hippo) from the harbours could be seen in Cruggleton (or Rigg) Bay until it was destroyed by a storm on Sunday 12 March 2006. Remnants of the prototypes, in particular concrete
Beetles that supported the floating roadways, can be seen at Eggerness, Portyerrock and Rigg Bay. The remains are now scheduled as national monuments by Historic Scotland. ==Currently==