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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from U. S. Project Trinity Report by Carl Maag and Steve Rohrer: 0445, however, the forecast was better, and shot-time was set for
0530. This gave the scientists 45 minutes to arm the device and
prepare the instruments in the shelters. The final countdown began at
0510, and the device was detonated at 0529:45 Mountain War Time from
the Control Point in the south shelter (3; 12).
No one was closer than 9,150 meters to ground zero at the time of the
detonation. With the exception of a few men holding the ropes of
barrage balloons or guiding cameras to follow the fireball as it
ascended, all shelter personnel were in or behind the shelters. Some
left the shelters after the initial flash to view the fireball. As a
precautionary measure, they had been advised to lie on the ground
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