PT boats appear out of nowhere

Its so dark I can hardly see the bow of our u-boat.
Pics have been brightened
Flag was frozen
PT boat did not see me it was so dark
Moving into the Sound - only the moon against the shore can be seen.
It least this gives me something to navigate by.
Just managed to sneak past two subnets
9:17PM - Locals, perhaps heading to the pub have illuminated me with their truck headlights.
Still hugging the shore as we emerge into the Flow