Reaktorhallen R1 - Zombie Shooter

DURING THE POST WORLD WAR II race among countries to arm themselves with nuclear weapons,
some risky decisions were made. One of them was the building of Sweden’s first nuclear reactor,
Reaktor 1, or R1, buried 25 meters directly underneath the the ground,
and within a 1 km of about 40,000 people. Nonetheless, in the heady days of the Cold War and nuclear armament,
it was deemed a tolerable risk for the scientists to be able to study reactions.
With the hope of achieving a scientific breakthrough, the scientists at R1 decided to conduct an experiment on July 13,
1954, at 18:59. They were attempting to generate a controlled nuclear fission reaction to produce more energy than what was put in.
But things went horribly wrong.
As the scientists activated the reactor, there was an eerie silence in the room. Then, suddenly, there was a loud buzzing sound,
followed by a blinding flash of light that filled the room. The reactor was not behaving as they had expected. Instead of a controlled reaction,
it was generating an uncontrollable chain reaction. The reactor began to overheat rapidly, and the control rods meant to control the reaction failed.
The situation quickly spiraled out of control. The scientists tried to contain the situation,
but they were helpless against the overpowering force of nuclear energy.
The reactor exploded, sending a massive cloud of radioactive material into the air.
The scientists working at the site were caught in the explosion and were transformed into zombies.
Now, 50 years later, the science lab has been overrun by the zombie scientists.
Your task is to clear out the lab and prevent the zombies from escaping.
The city has hired you as a professional zombie exterminator.
Armed with only a gun, you enter the lab. The silence is deafening,
and the eerie glow of the radiation reminds you of the tragedy that occurred here 50 years ago.
You cautiously make your way through the lab, searching for the zombies.
Suddenly, you hear a growling sound. You ready your weapon and prepare for the worst.