Before the auction, Jean Christophe Chataignier, director of the Osenat auction house, said the 1812 letter was expected to fetch between 10,000 and 15,000 euros.
Within a decade, Oyala will house the president, the government and - according to the master plan - up to 200,000 people. Where the inhabitants will come from is anyone's guess. The population of the entire country could fit into the city of Leeds, and the vast majority live far away, close to the coast.
These were avoided by a last-minute deal between the Republican-dominated Congress and the White House. However, economists warned at the time that fears of an abrupt cut in government spending were undermining business and consumer confidence.
In particular, the oceans are also vital as sponges for green house gases, taking carbon dioxide out of the atmosphere through two processes - dissolving straight into the water column and also through photosynthesis by phytoplankton.
