meninlove said There's a rumour circulating up here that the oil rig off Louisiana was hit by a US sub. It seems pretty unlikely.
Given the bad PR being suffered by BP and the operators of the rig, you'd think they'd announce this if it were true. And sue the US to cover their losses. Plus the US Navy would have to quarantine the submarine crew, to conceal the truth, and find a way to repair the submarine in secret.
Of course, the US has tried deception at sea before. The Hughes Glomar Explorer was an elaborate CIA ruse to raise a sunken Soviet submarine in the 1970s, disguising the recovery ship's mission as deep-sea manganese mining. But its cover was blown within a year, because you simply can't keep secrets like that, involving so many people in so many fields.
Interestingly, after being mothballed for years, the Glomar Explorer was refitted as a deep sea drilling platform, which is does today in the waters off Indonesia.