Why did the sidoarjo mud flow happen?

The Sidoarjo mud flow in Indonesia was triggered by a blowout in a natural gas well in May 2006. This blowout caused hot mud, gas, and water to gush to the surface, resulting in the continuous flow of mud that engulfed villages and farmlands. The exact cause of the blowout is still debated, with some attributing it to drilling activities gone wrong.