This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
USS SS testing snorkel. en July SS United States Navy submarine testing the first experimental Navy submarine snorkel in navsource org htm Navy photograph PDUSGovMilitaryNavy Original upload log en USSR SS testingsnorkel Mdnavman bytes no United States Navy submarine SS testing the first Navy submarine exexperimental