Just out of curiosity for someone more educated on drilling than myself, why would they use redundant hydraulic shut offs and not have some sort of electromagnet "dead man's switch" on there? I would think in offshore drilling a catastrophic rig failure would make those hydraulic shut offs pretty difficult to use and you'd want something that doesn't require manual triggering.

Good luck Hoop, hope this thing can be contained soon.

You see in this world there's two kinds of people my friend - those with loaded guns, and those who dig. You dig.