The speed has seen when neutron stars collide. The impact energy can form the short-term warp bubble that allows the radiation to travel faster than it usually travels. Two other things are making it possible to make particles travel faster than the speed of light. A) Virtual crossing where high-speed particles are impacting each other. If the speed of both particles is 0,8 times the speed of light the impact speed is 1,6 times the speed of light. B) Rising the escaping velocity of the particle higher than the speed of light. So behind the black hole's event horizon, the speed of particles is higher than the speed of light. The reason for that is that particles drop to the gravitational center at the same speed as escaping velocity. The fact is that crossing the speed of light is a paradox. That thing is quite easy to make in theory. The only thing that must do is to create an area where the light travels faster than light travels in the environment around it. Cherenkov's