I didn't know COD4

Same fact in Stalker...

I would really like to go there

Chernobyl was a massive disaster that shouldn't have happened and only did happen because of lack of decent safety guidelines and stupidity. Many people have died because of it and many people continue to suffer because of it.

Where have you seen this before?

Yeah. I loved that mission due to that actually, even though the amount of radiation present was probably not that realistic, and I felt like the detail in damage to the surroundings could have been better.

It was weird seeing some parts though that I remembered seeing in pictures. Good stuff that.