"The Russians believe that continued operations are safe, but they can't prove to our satisfaction that they are... And NASA has expressed concerns about the structural integrity of the PrK and the possibility of a catastrophic failure."
"NASA has chartered a team of independent experts to assess the cracks and leaks and help determine the root cause, Cabana said. 'This is an engineering problem, and good engineers should be able to agree on it.'"
"It's not a comfortable thing, but it is the best agreement between all the smart people on both sides, and it's something that we as a crew live with and adapt."
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