 "Otago" observed it from 21.5 miles and the crew was held in the enclosed citadel for only 20 seconds before allowed on the upper deck to observe the nuclear cloud.Cdr Tyrrell had witnessed the 1957 Christmas Islands hydrogen bomb test and saw the explosion as puny in comparison and well within safe limits for the crew at the distance.The NZBC journalists, Shaun Brown and David Barber of New Zealand Press Association on "Otago", saw it as an "angry... red fireball" and rising white mushroom cloud.