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Through a Canadian Periscope: The Story of the Canadian Submarine Service: Ferguson, Julie H., MacNeil, Rear Admiral Dan, Cairns, Vice-Admiral Peter W.: 9781459710559: Books - Amazon.ca
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YOKOSUKA, Japan (Aug. 2, 2021) Commander, U.S. 7th Fleet, Vice Adm. Karl Thomas, peers through the periscope aboard the Seawolf-class fast-attack submarine USS Connecticut (SSN 22), during a tour of the submarine
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File:US Navy 090513-N-5013K-062 Vice Adm. Tohru Izumi, commander in chief, Self-Defense Fleet, Japan Maritime Self-Defense Force (JMSDF), uses the periscope aboard USS Seawolf (SSN 21).jpg - Wikimedia Commons
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