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Yelov ducks but the rocket never reaches him. The exhaust from its engine flares brightly but it slows down and is held motionless in mid air. You stare in awe as it is suddenly thrown as if by a giant invisible hand into an energy field where it explodes harmlessly. The raildroid is evidently equipped with a directional gravity beam of enormous power. When the rocket exploded the air behind Yelov rippled like water. You guess that there is an invisible force field which keeps an atmosphere breathable for Yelov in the tunnel which appears to be open to the stars at its end. Will you: