They almost all do. They must be secret a though. I can't think of a single safeguard that can withstand 9000 degree temps.
Radiation weakens everything including concrete and steel. How can we safeguard against that?
With the new 3X more powerful Cern collider they will probably create a black hole capable of sucking our entire solar system through a 1/4 inch even horizon.:D
Point is that we don't know what's going to happen sometimes until it happens the first time.
Remember, there was a disagreement between involved scientist that the first nuclear bomb explosion might continue the reaction through the entire planet.
AND they did it anyway.
