British Porpoise-class submarine

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What Wikipedia says

The Porpoise class was an eight-boat class of diesel-electric submarines operated by the Royal Navy. This class was originally designated patrol submarines, then attack. They were the first conventional British submarines to be built after the end of World War II.

Excerpt from the Wikipedia article “British Porpoise-class submarine”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Geni, CC BY-SA 4.0, via Wikimedia Commons.