Doc Savage : you realise that even if the sail of the sub hasn't broken the surface, the sub is nontheless visibile from the helo.
Up to a certain depth the sub is visibile (depends also on sea condition, if the water is clear, muddy etc...) but the fact is if the sub contact is determined hostile, the helo won't just wait for it to come to the surface.
The moment it has visual identification it pops a torpedo and there goes your frogman+sail+sub.
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