Word: tunnelled
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...silos containing 100-ft.-long radio antennas that rise along with the missiles and guide them on their way. At the concreted entrance tower, 13 steps spiral downward to a portal and a blastproof revolving door. Behind the door, 69 steps drop underground to a cool, yellow-painted steel tunnel 1,687 ft. long and lined with cables, pipes and tanks for water, diesel fuel and liquid oxygen...
...From the tunnel, smaller passageways slide off to the missile silos, each 165 ft. deep and 40 ft. in diameter. Other tunnels lead to the antenna silo, and to a circular power house 70 ft. below ground where four generators purr out power enough for a city of 5,000 people...
...chief center of scientific interest is a tunnel cut into a mountain of soft rock, its mouth now blocked with a complex ventilating system. Four years ago a bomb exploded in that tunnel, and as the cavity that it made cooled down (both in temperature and radioactivity), scientists studied it intensively. It can now be entered without danger, is serving as a guide for future underground tests. Other tunnels, still too hot to enter, are explored chiefly by drilling...
...mammals. To get a germfree line started, researchers have to deliver germfree young by Caesarean section. Just before the pregnant animal would normally deliver, it is anesthetized, strapped to a miniature operating table, and its abdomen shaved and sterilized. Two sterilized tanks are prepared and connected by a sterile tunnel. The animal is slipped into the operating tank. A surgeon puts his hands in the rubber gauntlets that are sealed into portholes in the tank's sides. A set of sterile instruments is already in place. He delivers the young, drops them into a sterile tray, and passes them...
...electronic monster is named ZAR (Zeus Acquisition Radar), and when it sends its pulses into space to probe for incoming missiles, the fence will act as a shield to keep the powerful radio waves from frying all Kwajalein. Crewmen operating ZAR will go to work through a metal-shielded tunnel...