Europe is right now fighting an enemy it cannot see and protecting a vulnerability it has not mapped. Undersea drones are taking the conflict between Russia and the West below water. But these sea drones are not looking for soldiers or civilian targets: they are patrolling infrastructure thousands of metres below sea level, aiming to prevent vital communications cables from being severed.

In a silent, deep-sea war, Europe and its allies are already counting the cost of Russian damage to its vital undersea cables

In a silent, deep-sea war, Europe and its allies are already counting the cost of Russian damage to its vital undersea cables – the spinal cords that connect us to the global economy. Responsible for the transfer of 99 per cent of all digital data and carrying $10 trillion (£7.5

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