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It is shown that the energy in the centre of mass frame of two collidingparticles in free fall at any point of the ergosphere of the rotating blackhole can grow without limit for fixed energy values of particles on infinity.The effect takes place for large negative values of the angular momentum of oneof the particles. It occurs that the geodesics with negative energy inequatorial plane of rotating black holes cannot originate or terminate insidethe ergosphere. Their length is always finite and this leads to conclusion thatthey must originate and terminate inside the gravitational radius of theergosphere. The energy in the centre of mass frame of one particle falling intothe gravitational radius and the other arriving from the area inside it isgrowing without limit on the horizon.

High energy particles with negative and positive energies in the vicinity of black holes