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Originally Posted by Incubus
I actually really liked the schnorkel. From what I observed, it allows you to get, with upgraded engines, nearly the initial standard surface speed. Also, you can get away with going a little deeper than 'schnorkel depth'. I don't know if the game models the added stealth, but by going about 1-2 meters deeper, it decreases the wake considerably.
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In real life subs couldn't make any more than standard submerged speeds using the schnorkel; the pole could snap off under the pressure of higher speeds. Also, in even the slightest sea the water would wash into the opening, causing the float to close, causing the engines to suck all the air out of the boat, causing an emergency surface to get air to the suffocating crew.
In addition, at least one schnorkeling u-boat was spotted because an alert destroyer lookout saw diesel smoke coming
out of the water!
Also, upgraded engines are very unhistorical; all type VIIb and later boats had superchargers, and the 'regular' top speeds in the game are actually the speeds they made
with superchargers.
The game lets you get away with a lot of crap.