S.S. ROBERT E.LEE and U-166 (shipwrecks and remains) (NRIS 100002558)

Address: Address Restricted, Pilotttown Vicinity, Louisiana. County/parish:  Plaquemines Parish.

Added to the National Register of Historic Places December 07, 2018.

From Wikipedia:

German submarine U-166 (1941)
German submarine U-166 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 6 December 1940 at the Seebeckwerft (part of Deutsche Schiff- und Maschinenbau AG, Deschimag) at Wesermünde (modern Bremerhaven) as yard number 705, launched on 1 November 1941 and commissioned on 23 March 1942 under the command of Oberleutnant zur See Hans-Günther Kuhlmann. After training with the 4th U-boat Flotilla, U-166 was transferred to the 10th U-boat Flotilla for front-line service on 1 June 1942. The U-boat sailed on only two war patrols and sank four ships totalling 7,593 gross register tons (GRT). She was sunk on 30 July 1942 in Gulf of Mexico. (read more...)

National Park Service documentation: https://npgallery.nps.gov/AssetDetail/NRIS/100002558