The Fukushima Daiichi nuclear power plant in Japan still needs daily water injections to cool melted nuclear fuel more than 10 years after the 2011 earthquake and tsunami disaster. Each day, about 150 cubic meters of water are pumped into the three most damaged reactors to prevent temperatures from rising to dangerous levels. This water becomes contaminated with radioactive particles and must be filtered and stored, leading to more than 1,000 tanks holding treated water on-site. Unlike the Chernobyl nuclear disaster, where a massive concrete structure known as a sarcophagus was built to contain radioactive materials, no such concrete confinement has been placed over the damaged reactors at Fukushima Daiichi. The melted fuel, known as corium—a substance formed when nuclear fuel melts and mixes with surrounding materials—has not been fully located or removed. This has stalled any efforts to dismantle the reactors. Instead, the site is often described as an immense industrial construction site under constant tension, rather than a sealed and stable structure. Managing the contaminated water remains a major challenge. There are ongoing debates about the possibility of releasing the treated water into the ocean, as storage capacity at the site is expected to eventually reach its limit. However, the exact location and form of the corium remain unknown. To map hard-to-reach areas, remote-controlled robots are used due to the high levels of radioactivity in those regions. As long as the corium remains in place, continuous water cooling is necessary, and the long-discussed plan to build a concrete cover over the site cannot be seriously considered. The situation at Fukushima Daiichi continues to highlight the complex and long-term challenges of dealing with nuclear accidents and their aftermath.