Coal India arm Northern Coalfields (NCL) said that it has become the first PSU in the country to vaccinate its employees and their family members against COVID-19. "During...COVID-19, coal warriors...ensured uninterrupted coal supply to the nation...We left no stone unturned to get them vaccinated," NCL CMD Prabhat Kumar Sinha said. NCL has a strength of around 50,000 people.