submarines are not that slow some can reach up to 40 knots and more IIRC. Besides they have several tactical advantages that still make them indisposable.
Besides no mater how much people want to think there is a such thing as total stealth there is no such thing as total stealth. Using optcal camaflog that presents a picture of what is behind you and around you (i cant remember the name of it) leaves a distortion and you still have a shadow and a smell for dogs to pick up, radar stealth you still have a cross section and for submarines you still have some sort of noise. In the movie Hunt for Red October the sub had the magnetohydrodynamic drive (MHD for short) nicknamed the caterpillar well not to say the sounds they where supposed to hear wouldn't happen you would still have the sound of the water being forced for example.
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