Hardtack Teak
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Hardtack-Teak was an exoatmospheric nuclear test performed during Operation Hardtack I. On 1 August 1958, the shot reached an altitude of 78 km. Teak caused communications impairment over a widespread area in the Pacific basin. This was due to the injection of a large quantity of fission debris into the ionosphere. The debris prevented normal ionospheric reflection of high-frequency (HF) radio waves back towards Earth, which disrupted most long-distance HF radio communications.
