Chinese and Russian submarines are thought to be noisier and easier to detect.
U.S. vessels are just as quiet as Britain's
but the countries exchange information on where their submarines are patrolling. (Britain and France don't)
...
Both the British and French missile submarines are extraordinarily quiet, while their own sonar systems are designed to 'hear' the slightest sound from an enemy ship.
In this case both boats were on routine deterrent patrols, keeping their deadly missiles safe and ready to fire.
Both were listening hard for any other ships or objects to avoid, but each submarine was so quiet that the other was unable to hear it.
Only Britain, France and America are thought to operate such sophisticated and silent vessels. Russian boats are noisy by comparison.
But whereas British and American submariners routinely inform each other of roughly where their missile submarines are patrolling, to prevent just this kind of freak accident, it is understood there is no similar arrangement with the French.
As the French Navy generally has only one missile submarine on patrol at any one time, the British submarine had the remarkable misfortune to collide with the only vessel in the world which it is unable to detect, and knew nothing about.
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