![Ukrainians lay flowers at the memorial for \'liquidators\' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.](http://www.ecns.cn/hd/2019/04/26/c381c4d3e4994a5da26d5a73eed2361a.jpg)
Ukrainians lay flowers at the memorial for 'liquidators' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.
![Ukrainians lay flowers at the memorial for \'liquidators\' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.](http://www.ecns.cn/hd/2019/04/26/868fe9b3cb934dc1912e84749a48aab5.jpg)
Ukrainians lay flowers at the memorial for 'liquidators' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.
![Ukrainians lay flowers at the memorial for \'liquidators\' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.](http://www.ecns.cn/hd/2019/04/26/13cc21868a5f48579c96a2aae88f60ec.jpg)
Ukrainians lay flowers at the memorial for 'liquidators' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.
![Ukrainians lay flowers at the memorial for \'liquidators\' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.](http://www.ecns.cn/hd/2019/04/26/6d011874d2f849518b689f772c2cb30c.jpg)
Ukrainians lay flowers at the memorial for 'liquidators' who died during the cleaning up after the Chernobyl nuclear power plant disaster during a ceremony in Slavutich city, Ukraine, early April 26, 2019. In the early hours of April 26, 1986 the Unit 4 reactor at the Chernobyl power station blew apart. Facing nuclear disaster on unprecedented scale Soviet authorities tried to contain the situation by sending thousands of ill-equipped men into a radioactive maelstrom. The explosion of Unit 4 of the Chernobyl nuclear power plant is still regarded the biggest nuclear accident in the history of nuclear power generation.