What period of time elapsed between the first alarm and the main explosion?
Answer Eye-witness estimates of time varied between 10 to 60 seconds, probably because the witnesses heard or saw different ‘first events’. A reliable estimate of the minimum time was obtained by re-enactments of the time it took witnesses to move from where they heard/saw the ‘first event’ to where they were when hit by the blast of the main explosion. Of these re-enactments, the most reliable were the seven laboratory witnesses (1-7 on Fig. 4 and 5A) who, on hearing the first noise, stopped, looked, left the laboratory through two swing doors and ran north; the two witnesses on fire duty that day (locations 13 and 14 on Fig. 4) who ran towards Section 25A; and the witness at location 15 who was on a roof when he saw a ‘disc’ flying in the air and had had time to descend and move a few feet from the bottom of a cat ladder before the blast wave. During the proceedings, estimates of between 25-45 seconds were suggested and the Court (Paragraph 115) gave as their opinion: “The general pi
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