That last reason is why I suggest to keep the negative tank flooded on the surface. If you must submerge quickly, then you will. With an empty negative tank going at max speed you might just end up in plain sight of a warship and going below takes ages still.
When contact is made, react immediately with slowing down and try to match their course. Then your relative motion reduces to almost nothing and you can observe the convoy with a bit more peace. Best is to follow merchants, their course and speed is usually steady. Warships tend to wander about searching. So be on the lookout in case one gets too close.
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