HMS Conundrum

HMS Conundrum was the unofficial name given to the large CONUN drums used for laying the PLUTO pipeline. They were 30 foot diameter and weighed 250 tons.[1][2][3][4]

Views of "HMS Conundrum" components
A Conundrum being moved into position into a specially constructed dock in preparation for the winding on of the pipe. 
Pipe being wound onto a Conundrum, June 1944. 
A Conundrum loaded with pipe, ready to be towed across the Channel. 
A Conundrum being towed across the English Channel laying out pipe behind it. 

References

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