The diesel smoke from the U-boat can be only one colour.
If the smoke is dark, everyone complains it is too visible in the daylight.
If the smoke is light, people have started to complain that it is too visible at night!
If you don't provide any exhaust smoke, people complain that they want it!
The rule is: 'You can't please all the people all the time.'
Stiebler.
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