You're wrong this time. On the 14th of January 1942 at 0448, for one. Just
off Montauk Point. Captain Hardegen of U-123 fired his first torpedos,
sinking the Norness, Captain Harold Hansen. Without coastal charts, Captain
Hardegen proceeded past Rockaway Beach and into the Ambrose Channel. At
0140 on the 15th, while almost aground on Long Beach, he sank the Coimbra,
422', carrying 80,000 barrels of oil. He was attacked the next day by
bombers, but escaped.


DSK wrote:
There is in fact a German submarine sunk in the Potomac River.
However, it was not sunk there during the war, it was handed over to
the US Navy afterward. Then, as part of tests & exercises, it was
sunk at least twice. The last time it was sunk was off Piney Point in
1949, and is at least 65 feet under the surface.

So, while it is not "marked as an obstruction" on any chart, and no
German sub ever patrolled Long Island Sound, nor entered the Potomac
River in search of Allied convoys, and it's for darn sure no IJN
submarine ever shelled Seattle.... there *is* a U-boat sunk in the
Chesapeake!


https://www.denix.osd.mil/denix/Publ.../panther2.html

The truth is out there!