When making submerged attacks as you set up with the attack scope for AOB 90 shot, there is always a risk having your sub get run over by some merchant on your flank.
I tend to leave the observation scope just raised so that I can look through the water and set it for 90/270 degrees relative. I play with very clear water. So, it provides a quick safety check if I am in danger of collision. Usually, the first indication is the ability to screw noises directly through the hull itself.
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