Short answers, pulled from the story.
Operation Pluto was an undersea oil pipeline operation in World War II that ran from 1942 to 1945. The project began with proposals in early April 1942 and officially disbanded on the 31st of August 1945.
Clifford Hartley pitched the proposal for the continuous length of pipeline known as Hais, which stands for Hartley-Anglo-Iranian-Siemens. Brigadier Sir Donald Banks, Sir William Fraser, and George Martin Lees served as expert advisors who consulted Geoffrey Lloyd during the development phase.
The final operational configuration provided 600,000 gallons of petrol per day through 17 pipelines by December 1944. Dumbo lines surpassed their target of 400,000 gallons per day on the 15th of March 1945 and delivered 1 million gallons a day to the Rhine by the 3rd of April 1945.
A working Hais cable was successfully laid on the 22nd of September 1944 after multiple failed attempts earlier that month. This pipeline began delivering 60,000 gallons per day following its installation by HMS Latimer.
More than 85 per cent of the pipeline was salvaged between September 1946 and October 1949 using ships named Empire Ridley, Empire Taw, Empire Tigness, Wrangler and Redeemer. The system closed down to save manpower on the 7th of August 1945 and officially disbanded on the 31st of August 1945.