Depends.
If i want to conserve fuel, ill stay submerged during the day, and use as little of my battery as possible to safe fuel from recharging them.
If aircover is heavy, ill stay submerged.
If i detect a sound contact and get a plot on him, ill surface to intercept.
If its early war before SJ radar, ill stay submerged because i can hear alot farther then i can see. Conversely, i can cover more area by running on the surface.
At night, i almost NEVER submerge.
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