I find the way corporations use words to be very ironic.
Several people have pointed out that in order for something to be called a “spill”, whatever is spilling must have been contained beforehand. The Exxon Valdez was a spill, because the oil was contained in a tanker before it was spilled. In a spill, there is a maximum amount of oil that can be released accidentally. But the leak from the BP oil rig explosion, which happened one month ago, could go on for a very long time.