But from reading the article http://online.wsj.com/article/SB10001424052748704423504575212031417936798.html http://online.wsj.com/article/SB1000142405274870442

But from reading the article http://online.wsj.com/article/SB10001424052748704423504575212031417936798.html http://online.wsj.com/article/SB1000142405274870442350457521... the acoustic control just activates the blowout preventer, and the dead-man switch should do the same thing. But I don't know anything beyond reading the article.