''HMS Conundrum'' was the unofficial name given to the large drums used for laying the World War II Normandy landings PLUTO pipeline. The drums were cone-ended, hence the abbreviation CONUN and were used in the sea, hence subsequent ship ''HMS Conundrum'' nickname. They were 30 feet in diameter and weighed 250 tons.PLUTO - PIPELINE UNDER THE OCEAN
/ref>Pipeline Under the Ocean
/ref> Views of "HMS ''Conundrum''" components File:IWM-T-30-Conundrum-preparation.jpg, A ''Conundrum'' being moved into position into a specially constructed dock in preparation for the winding on of the pipe. File:IWM-T-32-PLUTO-Conundrum.jpg, Pipe being wound onto a ''Conundrum'', June 1944. File:IWM-T-54-Conundrum-loaded.jpg, A ''Conundrum'' loaded with pipe, ready to be towed across the Channel. File:IWM-T-29-PLUTO-Conundrum-at-sea.jpg, A ''Conundrum'' being towed across the English Channel laying out pipe behind it.

References

{{DEFAULTSORT:Conundrum Western European Campaign (1944–1945) Oil pipelines in the United Kingdom Coastal construction Anglo-Persian Oil Company