Several European members of NATO are considering buying new high-endurance underwater drones for their navies to protect critical infrastructure and hunt Russian submarines.

The pair of drones, known collectively as GreyShark, were developed by German technology companies EUROATLAS and EvoLogics for reconnaissance and intelligence-gathering missions, including information on vital pipelines and cables along the seabed.

The autonomous underwater vehicles (AUVs) can also be used for mine detection and anti-submarine warfare (ASW), the companies say. Many NATO nations are heavily investing in ASW and the alliance held drills focused on countering submarines in the Baltic Sea this month.

A shorter-range version of the penguin-shaped drone, dubbed Bravo, and a longer-lasting, hydrogen-cell-p

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