This image was acquired from
flickr. 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:
outdoor animal PS USN USS Pickerel SS surfacing from depth of feet with degree upangle during routine training exercise off Oahu Territory of Hawaii the Pickerel commissioned April at Portsmouth New Hampshire established what is believed to be the world record for submerged operations by snorkeling from Hong Kong to Honolulu