Will a black hole open under France during the Hadron collider test?

What a question, only for I had to do it in college I'd probably never know

Can the CERN team be absolutley certain that there wil not be potentially serious results? I dont think so. I was amazed to hear them say the particles shall be accelerated to 99.999999% of the speed of light - How can they be sure, surely there uis verry little diference between that and the actual speed of light, and if that occurs - what else will happen?