How much concrete was used to cover up Chernobyl?

Approximately 400,000 cubic meters of concrete were used to encase the Chernobyl Nuclear Power Plant's damaged reactor after the disaster in 1986. This massive effort involved constructing a protective sarcophagus, known as the Shelter Object, to contain the radiation and prevent further release of radioactive materials. In 2016, a more advanced structure, the New Safe Confinement, was placed over the original sarcophagus to provide additional containment and facilitate the decommissioning process.