Just a small correction to the above.
The pipeline laid from the Isle of Wight to the Normandy beaches went under the name of "operation PLUTO", as in Pipeline Under The Ocean.
Operation Juno was a different scenario altogether, and instigated by the Germans:
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Operation Juno was a German naval offensive late in the Norwegian Campaign.
Launched on June 8th, 1940, as an operation to relieve pressure on the German garrison at Narvik, the mission quickly changed into a hunt once the Kriegsmarine realized that the Allies were evacuating.
Lost in this operation was the British aircraft carrier HMS Glorious and two destroyers by the German battlecruisers Scharnhorst and Gneisenau.
The only major thing left from the Pluto operation, on the Island now are the main road from Blackgang to Freshwater, the Military Road, named after the Army engineers who actually built it, and one defensive Pill Box.
All other traces hae been lost to the sea over the years throught costal erosion.