Drill Baby Drill

I heard the spill area has already surpassed the Exxon Valdez spill. Can someone confirm this, site the source and update the wiki as the spill continues to grow?

It is amazing Transocean, owning 140 operational rigs worldwide, utilizes no preventive technology for this scenario. I remember there was safety system for natural gas lines in the home that would drop a ball bearing into the pipe during an earthquake. This would block the gas, limiting the risk of explosion or fire. Is it not as simple as this? How about a large depleted uranium rod/stopper that drops down the line if certain shear or torsion tolerances are surpassed. A locking mechanism may be required, a more stable metal or even an activation button but you get the idea.