That's when only the conning tower (turm) is visable above the water. You can't see the fore and aft decks as they are just below the surface. You can manually call to submerge to 7 or 8 meters so you can run 'decks awash'. Still plenty of speed and you're less visable, plus the watch crew is still out doing their job. 
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Gary
No Borders, No Language, No Culture =s No Country
I'm a Deplorable, and proud of it.
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