Asdic "only"

[Mister_M]

Originally Posted by Randomizer

Here Arctic Convoy Instructions there is a throw away entry regarding horrible acoustic conditions in the Arctic using ASDIC and the context suggests active rather than passive detection means.

Quoting :

"Article 9014

Asdic Conditions

Owing to temperature layers, asdic conditions in these northern waters have often found to be very bad, and experienced escort groups which have had success in the Atlantic have frequently reported this fact when escorting North Russian convoys. Cases have often occurred of a U-Boat torpedoing a ship and completely escaping detection both before and after the attack.

Experience has also shown that echoes can often be obtained from surface craft while a submerged u-Boat remains undetected."