Uneventful Day at Chernobyl Reactor 4

Hey, There's No Treasure Here
Pumps

As you take a look around the pumps, suddenly a massive explosion shakes the entire plant.
The thought crosses your mind 'That's probably not supposed to happen'.
As you wonder what that noise might have been you figure that you can either:

  1. Go to the reactor core
  2. Take a look from outside