About half the personnel of the barber college who had not been caught by the alarm were roaming the rooms of the small house, drifting singly out the back door at ten-minute intervals. Dark went to the front window and looked across the street at the barber college. The street was full of men carrying heat pistols, moving restlessly, facing the barber college. Some of them were in police uniform. Squads of them moved about on the college grounds, and a few were in the yards of houses on this side of the street. Dark watched the roof. As he did so, from its center a helicopter rose into the air, hovering over the building, moving upward slowly. So that was the Chief's escape method. He had smuggled a helicopter into the domed city itself! But how was he to get out of the city in it? The appearance of the copter threw the men outside into confused excitement. They ran about, aiming their short-range heat beams futilely up at the rising copter. A military tank, undoubtedly the one the Chief had been told about, spun around the corner. It stopped, and its guns swung upward toward the copter. But they remained silent. Heavy heat beams or artillery could puncture the city's protecting dome. The copter went straight up, gathering speed. Up, and up, and it did not stop! It hit the plastic dome near its zenith. It tilted and staggered. It ripped through the dome and vanished. Immediately, sirens began to wail throughout the city. Doors clanged shut automatically everywhere. Lights and warning signs flashed at every street corner, advising citizens to run for the nearest airtight shelter. The dome was punctured! Emergency crews would be up within minutes to repair the break, and very little of the city's air would hiss away. But, in the meantime, every activity in Mars City was snarled by the necessity to seek shelter. The Chief had, indeed, created a situation of consternation in which it would be easier for the Phoenix men to elude their enemies. The armed men of the government forces were already running for the houses in this area. Some of them were headed for the house from which Dark watched. The Phoenix men were donning marsuits. They would admit the refugees, after requiring them to lay down their arms, and then leave the house in their marsuits. Dark grinned happily, and walked quickly through the house to the attached garage. He climbed into the groundcar, started the engine, and opened the garage door by the remote control mechanism on the dashboard. Accelerating at full power, Dark drove the groundcar out of the garage and spun into the street. The men afoot, seeking entrance to the houses, paid no attention. The tank began to turn ponderously in his direction, but by the time it was in a position to bring its guns to bear, Dark's groundcar had reached the corner and raced around it into the broad thoroughfare leading to Mars City's east airlock.