U.K. says Russia "likely" training dolphins in Ukraine's occupied Crimean peninsula to "counter enemy divers"

London — British military spies on Friday said Russia appears to be training combat dolphins in the annexed Crimean peninsula to counter Ukrainian forces. In its latest update on the war in Ukraine, U.K. Defence Intelligence said the Russian Navy had invested heavily in security at the Black Sea Fleet's main base at Sevastopol since last year.

"This includes at least four layers of nets and booms across the harbor entrance. In recent weeks, these defences have highly likely also been augmented by an increased number of trained marine mammals," it added. "Imagery shows a near doubling of floating mammal pens in the harbor which highly likely contain bottle-nosed dolphins."

Latest Defence Intelligence update on the situation in Ukraine - 23 June 2023.

Find out more about Defence Intelligence's use of language: https://t.co/ALCbH4WFSc

🇺🇦 #StandWithUkraine 🇺🇦 pic.twitter.com/lCXZ3gySdu — Ministry of Defence 🇬🇧 (@DefenceHQ) June 23, 2023

The animals were "likely intended to counter enemy divers," it added.

The Russian Navy has used beluga whales and seals for a range of missions in Arctic waters, the update said.

A harness-wearing whale that turned up in Norway in 2019, sparking speculation it was being used for surveillance, reappeared off Sweden's coast last month. Norwegians nicknamed it "Hvaldimir" — a pun on the word "whale" in Norwegian (hval) and a nod to its alleged association with Russia.

Hvaldimir's harness had a mount suitable for housing an action camera, and the words "Equipment St. Petersburg" printed on the plastic clasps. Believed to be 13-14 years old now, the whale was seen swimming rapidly in May off Sweden's coast, with experts suspecting hormones could be driving the mature male "to find a mate."

"Or it could be loneliness as belugas are a very social species," Sebastian Strand, a marine biologist with the OneWhale organization that has tracked Hvaldimir, told AFP in May. "It could be that he's searching for other Beluga whales."

In 2016, Russia's defense ministry sought to buy five dolphins as part of attempts to revive its Soviet-era use of the highly intelligent cetaceans for military tasks.

Both the Soviet Union and the United States used dolphins during the Cold War, training them to detect submarines, mines and spot suspicious objects or individuals near harbors and ships.

A retired Soviet colonel told AFP at the time that Moscow even trained dolphins to plant explosive devices on enemy vessels. They knew how to detect abandoned torpedoes and sunken ships in the Black Sea, said Viktor Baranets, who witnessed military dolphin training in the Soviet and post-Soviet eras.

The U.S. Navy used sea lions deployed to Bahrain in 2003 to support Operation Enduring Freedom after the 9/11 attacks in New York and Washington.