A gun turret on the wreck of USS Nevada.
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USS Nevada Gun Turret
Gun turret on the wreck of USS Nevada  seen during Dive 06 of the 2025 ROV and Mapping Shakedown expedition. Having been fired on for days before capsizing and being ripped apart while sinking, major pieces of Nevada, like this gun turret, lie scattered across a sprawling debris field on the seafloor south of Honolulu, Hawaiʻi.
Credit

NOAA Ocean Exploration, 2025 Beyond the Blue