Pile these factors on to a hot summer training session under heavy protective gear, and you have a recipe for some serious fluid loss.

Engineers had spent days pumping heavy drilling fluid into the leaking well head on the ocean floor in a high-pressure bid to smother the gushing crude and ultimately seal the well with cement.

Supercritical fluid extraction is a new extraction technique, which can't extract the ions substance such as heavy metals directly, but can extract the ions by chelating with chelating agent.