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RFE/RL’s Ukrainian Service correspondent Yevhen Solonyna ventured inside the concrete sarcophagus of Chernobyl’s Reactor No. 4 in 2018 for a rare and risky glimpse at the stricken power plant’s radioactive ruins. On April 26, 1986, a routine safety test at the nuclear power plant spiraled out of control leading to the world’s worst civilian nuclear disaster.