Ushant would ever see. During World War II, a force of British Commandos and US Army Rangers of the 29th Provisional Rangers successfully attacked a German radar installation on the island. In March 1978, the oil tanker "Amoco Cadiz" ran aground at Portsall about from the island, leading to major pollution of the Brittany coast. According to an old Breton proverb, "" ("He who sees Molène sees his pains / He who sees Ushant sees his blood / He who sees Sein sees his end / He who sees Groix sees his cross"). This proverb is related to the area around
Oil tanker instrument, Shell consulted the "London Tanker Brokers’ Panel (LTBP)". At first, they divided the groups as "General Purpose" for tankers under ; "Medium Range" for ships between 25,000 and and "Large Range" for the then-enormous ships that were larger than . The ships became larger during the 1970s, which prompted rescaling. The system was developed for tax reasons as the tax authorities wanted evidence that the internal billing records were correct. Before the New York Mercantile Exchange started trading crude oil futures in 1983, it was difficult to determine the exact price of oil, which could change with every contract.