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Two three-component electromagnetic detectors were placed 5.3 miles from ground zero to monitor the electromagnetic field of the event. Field strengths from 4.7 times 10 to the -8 amp-turns/ meter to 6.2 times 10 to the 6th amp-turns/meter, in the frequency range of 1 to 4,500 cps, were to have been recorded on magnetic tape. No signals were recorded. (Author), Report on Operation Sun Beam Shot Small Boy, Proj. 7.8.1

A number of versatile deep sea diving assemblies were developed and produced at the Naval Ordnance Laboratory. These are capable of taking tons of equipment to the bottom of the deepest sea and returning after a preset time with recorded data. The assembly has no inherent sonic, magnetic, or electromagnetic fields. (Author)