Hughes constructed three 'Hippo' caissons were towed from the Morfa to the test site Rigg Bay, Solway Firth near Garlieston, Scotland.
Prototypes of the harbours were constructed at Conwy in North Wales and then transported and positioned in Wigtown Bay, where they were tested and modified through 1943 and 1944.
James ('Jim') Boughtwood Comber (1929 - 7 September 2005) was born at Garlieston, Scotland, into a famous horticultural family.