How the spill is cleaned up depends on where it happened. In smaller bodies of water oil does not spread as much and cleanup is easier. Oil floating on the surface can be held away from the shore by booms and cleared with skimmers. Booms are barriers that extend about three feet below the water surface. They are anchored near the shoreline.
Booms intercept and contain the oil.
Skimmers, such as vacuum machines or oil absorbent plastic ropes, are placed inside the boom to scoop up the oil. Booms and fences are often of little use in the open seas. They cannot contain a spill when there are big waves or strong currents. Once the oil is whipped into a froth called a mousse, skimming is difficult. Sometimes chemicals are used to speed the disposal of the oil into small globules that are more easily eaten by microorganisms.