They're three unsung heroes of Chernobyl.
On April 26, 1986, the world experienced the worst ever nuclear disaster.
It occurred at the Chernobyl Nuclear Power Plant, located in Ukraine. Immediately after the meltdown, dozens died. 30 years later, the number of lives lost to the plant's radiation lies somewhere in the tens of thousands.
If not for the work of three brave men, we may have lost millions of lives instead.