According to the United States Government, the sinking of the USS Discovery in New York Harbor in 2007 caused a large quantity of crude oil to be discharged into the sea. The government immediately responded with the construction of an oil fence. Using chlorine derivatives, they sterilized the entire zone of polluted sea and constructed a huge marine decontamination facility. Biological reactors managed in "nodes" were installed inside the Big Shell, and it became a symbol of environmental protection. Also, the Big Shell utilized a genetically altered form of sea lice that had its DNA altered with that of the bacterium Pseudomonas to give it the ability to decompose crude oil through an enzyme in its body. They were used to a great extent in order to reduce costs and the number of spill ma