"Houston, we have a problem."? When Apollo 13 crashed into the Pacific Ocean in 1970, it was carrying a radioisotope thermoelectric generator containing 3.9 kilograms of plutonium-238. No radioactivity has been ever been detected from it in the subsequent forty-eight years. Should the plutonium-238 stay at the bottom of the Tonga Trench or should NASA attempt to recover it? Dont forget to include any challenges put forth in the Finessing the fuel: Revisiting the challenge of radioactive waste disposal article. (And failure is not an option...