Military whales and dolphins: What do they do and who uses them?
https://www.nationalgeographic.com/news/2019/5/140328-navy-dolphin-sea-lion-combat-ocean-animal-science/

Why These Animals Were Accused of Being International Spies
https://www.nationalgeographic.com/news/2018/02/lizard-nuclear-spying-animal-espionage-spd/

Why Whales and Dolphins Join the Navy, in Russia and the U.S.
https://www.nytimes.com/2019/04/30/magazine/beluga-whale-russia-military-dolphins.html

The US Navy's combat dolphins are serious military assets
https://www.businessinsider.com/the-us-navys-combat-dolphins-are-serious-military-assets-2015-3