I figured out that you can use the observation scope when running deep to look up at the surface and see destroyers dropping on you and also the direction they drop so I know which way to jink to get the most distance beetween me and the Wasserbomb when it goes off. even at 200 meters depth you can see above you quit clearly. Yoy can also use it to stay under a ship in convoy if forced under so that the escorts cant get to you. Then i wait getting deeper and deeper drop a bit behind the transport im under go flank and then jink left or rightthru the convoy going silent after i jink. That usually throw the escorts off.
Anybody else try this? (Note has to be observation scope not attack scope because observation scope can look directly up)