An urgent 7am call got Normandie’s commander, Capt. Thomas Vuong, up from his bunk. He ordered the frigate’s submarine-hunting helicopter to be readied for flight, waking its pilot.

“We spotted its attack periscope,” Vuong told AP on board Normandie in an exclusive interview.

“Then it dived again,” he said. “We were asked to hunt for it. We succeeded.”

Once airborne, the Normandie’s NH90 helicopter hovered over the waves and lowered its submarine-detecting sonar into the sea. The frigate also used its sonar, and together, they zeroed in on the sub’s position and “attacked” it in turn.

“Intelligence confirmed to us that there were no friendly submarines in the sector, so we were certain that it was an enemy submarine,” the helicopter pilot, Lieutenant Olivier, recounted. The French navy withheld his last name for security reasons.

“So the frigate was able to fire a torpedo and destroy the submarine,” he added – but not for real, of course.

The frigate and its helicopter pinpointed the submarine with sufficient accuracy to be sure that it wouldn’t have survived had actual torpedoes been fired.

The Normandie crew of 146 mariners got no advance warning of the German sub “attack,” to test their readiness in the inhospitable environment above the Arctic Circle, Vuong said.

NATO now includes Sweden,which formally joined as the 32nd member on Thursday, ending decades of post-World War II neutrality. Finland joined NATO in April 2023 in a historic move after decades of its military nonalignment.

In both countries, Russia’s aggression in Ukraine triggered a dramatic shift in public opinion, leading to their May 2022 applications to join the trans-Atlantic alliance.

The Nordic drill in the northern regions of Finland, Norway and Sweden involves more than 20,000 soldiers from 13 nations. It is part of wider exercises called Steadfast Defender 24. They are NATO’s biggest in decades, with up to 90,000 troops involved over several months. They’re aimed at showing the alliance can defend all of its territory up to its borders with Russia.

German submariners are more familiar than Normandie with Norway’s deep and narrow fjords and the cold Arctic waters that can complicate submarine detection, Vuong said.

Loading

The drill was “extremely beneficial, because we reach a very high degree of realism and so we better prepare our teams,” he said. “The fjords are a special environment, with a temperature profile different to what we know in the Atlantic.”

“To be able to train our teams here, against this threat, is extremely valuable and extremely stimulating,” he added. “This is their playing field. So they know the hiding places.”

AP

Get a note directly from our foreign correspondents on what’s making headlines around the world. Sign up for the weekly What in the World newsletter here.