Click your chief and he has various orders that allow you to crash dive, blow ballast, etc, but also run silent. Remember, running silent means no torpedo reloads, repairs or etc can be done so be cautious and remember to remove it when not required. Running silent and going faster than 1/3rd is a waste. Only speed up if you know they dropped a charge on top of you and your turn isn't going fast enough. You can use the observation scope under water (O key) to see the charges or boats. I use the observation scope a lot, but be careful to not let it get damaged.
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