Scary Scenario bout Gulf Oil Spill

Here's a scary possibility - hopefully it's remote: The whole rig underwater is leaning and could topple over and cave in the gulf floor.  Worst case that could create a giant sink hole, release 2 or 3 billion barrels of oil into the Gulf, and cause seismic tremors that affect the other deep sea oil wells. Meaning the Gulf is finished.  Hopefully, of course, this won't happen.