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: 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
before the blast wave arrived. Project personnel located beyond the
shelters, such as at the Base Camp and on Compania Hill, were also
instructed to lie on the ground or in a depression until the blast
wave had passed (1). However, the blast wave at these locations was
not as strong as had been expected.
In order to prevent eye damage, Dr. Bainbridge ordered the
distribution of welder's filter glass. Because it was not known
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