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Several reasons.
1) The BOP has no sealing power anymore, all of the rubber/seals have been sandblasted away, and all of the sealing shears are abraded. It would never hold pressure.
2) There is something in the BOP that's blocking it from closing. Drill pipe, cement, baby aliens, something.
3) All of the hydraulics are FUBARed now between them pumping mud backwards through there for the top kill, and seawater infiltrating everything. I don't think there is a true manual switch (like a screw closing gate). Remember, this thing is 500 tones, 80 feet tall, and under a mile of water. It's not really meant to have someone walk over and put a wrench on a bar and close it.
Honestly, #1 trumps them all, it wouldn't matter if it was in 100% working order, they would close it and create a high pressure, high velocity flow through the busted seals.
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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