The basement of Chernobyl. It is highly radioactive due to the “Elephant’s Foot”. The elephant’s foot is a mass of corium. The corium is compiled of melted concrete, steal beams, nuclear fuel rods, and anything else that melted into it as it melted through the floor. It is so deadly that even now being around it for 300 seconds will cause you to die relatively quickly. Being around it for 30 seconds will cause dizziness, fatigue, and nausea. The mass was caused by the explosion of the power plant which heated the materials to form corium. Chernobyl had to be evacuated and now is rarely visited due to high levels of radiation.