There is one event which dwarfs the oil drilling disaster of BP. It is a man made volacano caused by drilling for oil and gas. This happened in 2006, when the company operating the concession, PT. Lapindo Brantas, did not find oil and gas, but activated a mud volcano.
It is now four years that the volcano spits about a 100,000 m3 of mud every day. There are 30,000 homeless, a newly built motorway and a the main train connection between Surabaya and Malang (both cities in Eastern Java) is interrupted. To contain the mud produced by the volcanic eruption, dams were built and the mud is channelled into the River Brantas, which in turn takes it into the Java Sea. The extent of the disaster can be seen on satellite photographs (-> Google Earth).
I have been to the site in 2008 - on my way to pay a visit to a natural volcano, Gunung Bromo, and I was quite impressed by this first man made volcano.