What say you about this?
Quote:
All offshore rigs have one main switch to shut off the flow of oil by closing a valve located on the ocean floor. There is also supposed to be a backup called a “dead man,” that will shut down the well in the event of a catastrophe on the rig.
Apparently neither of these devices worked on the Deepwater Horizon rig operated by British Petroleum (BP). The crew members who would have been closest to the shutoff switch are among those missing and presumed dead. If the rig was equipped with an acoustic trigger, it would have been a last resort option and could have been activated from a remote location.
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$500K device may have prevented oil spill
I certainly am no expert, just sorting through tons of info. This seems pretty logical to me.