Siebe Gorman Helmet. #7055

This Siebe Gorman dive helmet 12 bolt collection was owned by a navy salvage diver in WA. He was involved in the Montebello blast.
In 1952 the British joined the exclusive nuclear club by detonating their first atomic weapon.

The Montebello Islands were the site of three atmospheric nuclear weapon tests by the British military: one in 1952, and two in 1956.

HMS Plym, moored in Main Bay on Trimouille Island, was the site of Operation Hurricane, the first-ever atomic weapon tested by the United Kingdom, on 3 October 1952.

While subsequent British tests were conducted at sites on mainland Australia, in 1956 there were two land-sited tower-mounted tests, on Trimouille and Alpha Islands.The second of these, codenamed “Mosaic G2”, was the largest nuclear explosion in Australia, with an official yield of 60 kilotons. Mosaic G2 was later described as an “exceptionally “dirty” explosion”, whose fallout contaminated large areas of mainland Australia, as far away as the Queensland towns of Mount Isa, Julia Creek, Longreach and Rockhampton. Photos to come

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