The reason for a TA is so a submarine can see behind it if you look at the kilo theres a black patch about 45 degrees behind where it is totaly blind, back in the cold war days russian submarines didnt have towed arrays so in order to get around and see if there was any one following was to do a crazy ivan.
The idea was if the enamy submarine was moving they would be close enough to detect the americans grew wise to it so SOP ment to stop and shut everything not nessasery down to avoid detection.
Whats more a crazy ivan is where a submarine will double back at high speed to see if your there immagine the 48,000 tonne typhoon doing that and slamming into a 688 at full pelt (30 knots) the 688 would be smashed to bits and sunk easily the phoon would have fair damage but could remain afloat due to thier hull design and 19 water tight compartments, but thats the reason.
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