Procedure has never been tried under 5,000 feet of water.
BP is force-feeding heavy drilling mud into the well in the Gulf of Mexico as their escalated attempt to plug it up. The maneuver has never been tried before under 5,000 feet of water.
The procedure is known as a ‘top kill,’ and only has around a 60 to 70 percent chance of working. 
BP spokesman Steve Rinehart told Huffington Post that the company will begin pumping mud for hours, but it may take days for the results to be known. The idea is to pump enough mud into the gusher to overcome the flow of the well. After, engineers plan to follow the mud with cement to permanently seal it.
On April 20, BP was leasing the rig Deepwater Horizon when it exploded, killing 11 workers and triggering a spill that has gushed at least 7 million gallons of oil into the Gulf.
Here's what's being said about the procedure:
» Huffington Post: BP Starts 'TOP KILL' Method As Next Attempt To Stop The Gulf Leak
»Wall Street Journal: 2nd UPDATE:BP Says Procedure To Kill Leaking Well Has Begun
»Fox News: BP 'Top Kill' Attempt: Now you see it...
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