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The Chernobyl Nuclear Power Plant sarcophagus or Shelter Structure () is a massive steel and concrete structure covering the nuclear reactor number 4 building of the Chernobyl Nuclear Power Plant. Currently the sarcophagus resides inside the New Safe Confinement structure. The New Safe Confinement Structure is designed to protect the environment while the sarcophagus undergoes demolition. The sarcophagus was designed to limit radioactive contamination of the environment following the 1986 Chernobyl disaster, by encasing the most dangerous area and protecting it from climate exposure. It is located within a large restricted area known as the Chernobyl Exclusion Zone.