[Ernest_at_the_Beach]

There was no mention of how they know they got mud up into the annulus....where it was speculated the oil flow was coming from.

[justa-hairyape]

They were just supposed to cement the drill pipe and the innards of the casing during the Top Kill. The Bottom Kill will go after the annulus between the casing and the well bore walls. That is the permanent solution that stops any potential sea floor leaking. The Top Kill apparently morphed into a Stop the Stack Leaks operation. And it was successful as far as that was concerned.

What we have not been shown since they started the Injectivity Test, is the base of the BOP near the wellhead. There has been an ROV there constantly. Probably all kinds of stuff bleeding out down there.