morsch said: "The cask survived re-entry, as it was designed to do,[18] and no release of plutonium has been detected. The corrosion resistant materials of the capsule are expected to contain it for 10 half-lives (870 years).[19]"

nafizh asked: "So after 870 years, it begins to pollute the water?"

It was a question about the Apollo 13 SNAP-27 unit, which was spilled in a freak accident that is unlikely to be repeated.