A diagram of Grommet Cannikin shot cavity where the 5 Mt W71 warhead would be emplaced for the test. The diagram includes the location of instrumentation, pumping equipment for cavity dewatering, slifer cable for yield estimation, bulkheads, and the secondary shaft for cabling.
Atomic Energy Commission, Nevada Operations Office
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"MANAGER'S COMPLETION REPORT AMCHITKA ISLAND, ALASKA, MILROW AND CANNIKIN"