On the bottom was all slimy mud, broken bottles and bits of glass and bricks and nails and old stuff, everything.

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The team also hopes to take samples of mud from the bottom of the lake, to better understand the geological history of the West Antarctic Ice Sheet and Earth's past climate.

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More heavy mud was sent to the bottom to control the kicks.

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PCBs are now embedded at the bottom of the river, getting buried under more and more mud as time goes on.

FORBES: Fact and Comment

From that point, it will take another few days to permanently seal the well with mud and cement from below in what's called a "bottom kill" procedure.

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Halliburton said that the report "accurately places responsibility on BP as the well owner for its operational decisions, " which included using a heavy fluid designed to keep gas from entering the well, called drilling mud, that was "too light" and probably mixed with the cement at the bottom of the well, and drilling too narrow a well.

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