Ship Stats

Depth: 110 feet

Vessel Type: Type VIIC German U-boat

Length: 220 feet Breadth: 20 feet

Gross Tonnage: 761/865 tons (surfaced/submerged) Cargo: N/A

Built: 1940, Flensburger Schiffsbau-Ges, Flensburg, Schleswig-Holsein, Germany

Hull Number: 471 Port of Registry: Germany

Owner: German Navy

Lloyd's Register Details: N/A

Former Names: N/A

Date Lost: May 9, 1942

Sunk By: USCGC Icarus Survivors: 33 of 48 survived (15 dead)

Data Collected on Site: Still and video photography; site plan; high and low resolutions multibeams; 3-D video, listed on the National Register of Historic Places.

Significance: U-352 is significant to American military history, maritime history and historic archaeology as it was the first U-boat sunk by the United States Coast Guard off the American East Coast during World War II's Battle of the Atlantic.

Wreck Site

Of the U-boats off North Carolina's coast, U-352 had the least eventful operational career. However, the wreck site is likely the U-boat most frequently dived by recreational divers. Unlike U-85 and U-701, U-352 rests south of Cape Hatteras, off Cape Lookout in more stable conditions and more inviting Gulf Stream water for the average diver.

Sea life at the site of U-352 is prolific and typical of a sub-tropical marine ecosystem. The site is heavily encrusted with coralline algae and supports an array of cnidarians, such as sea anemones and corals. Also, on the site, the density of red barbier baitfish and amberjack is such that it often hinders photographic documentation.

sonar visualization of U-352
Sonar visualization of U-352 wreck site. Click here for a larger image. Image: ADUS
scaled multibeam image of U-352
Multibeam survey of U-352 wreck site. Click here for a larger image. Image: ADUS
multibeam image of U-352
Multibeam survey of U-352 wreck site (NOAA Ship Nancy Foster, 2016). Click here for a larger image. Image: NOAA

Historical Background

Kapitänleutnant Hellmut Rathke took full command of U-352 on August 28, 1941. In January, U-352 transferred from Kiel to Bergen, and set out for its first patrol on January 20. U-352 was part of Group Schlei and was ordered, along with twelve other U-boats, to converge on an area West of Rockall and to begin looking for convoys. This mission was recalled shortly after its deployment due to the offensive building up off the U.S East Coast. Group Schlei was to return to France and begin preparing for deployment to U.S. waters.

However, U-352 would not be reaching U.S. waters with the rest of Group Schlei. Eight of the twelve boats were redirected to the Faroes Islands in Iceland and Scotland. They spent several weeks at sea, which were largely uneventful. Rathke attempted to carry out at least one attack, but depth charges kept him from being successful. Although, U-352 encountered no serious damage on its first patrol, no ships were sunk either. At the end of February, the vessel retuned empty handed to St. Nazaire.

watercolor of U-352 drawn by Captain Rathke
Watercolor of U-352 at sea. Painted by Captain Hellmut Rathke. Click here for a larger image. Photo: Courtesy of the National Archives

After minor repairs in St. Nazaire, U-352 headed for the U.S. East Coast on April 7, 1942. Beginning on May 5, far out to sea off Cape Hatteras, N.C., U-352 began a game of cat-and-mouse with the Swedish merchant vessel SS Freden. Rathke moved into position twice, each time firing a torpedo from the bow, but each missed. Despite having missed, the crew aboard the Freden believed they would be hit and decided to abandon the ship. When they stopped the ship in order to launch the lifeboats, U-352 passed right by them without notice and somehow lost contact. Meanwhile, Freden was not sinking and Freden's captain ordered everyone back aboard to resume getting underway.

The following day, Rathke came across Freden again. Over the next several hours, Rathke got off two torpedoes, both of which missed. However, once again, the crew on Freden panicked and took to the lifeboats. Evidently during the process of launching boats, Freden turned the stern towards U-352 so as to present a smaller target. Rathke mistook this for the vessel running off full-speed and gave up chasing Freden. The Freden crew drifted in their lifeboats all night. On the morning of May 7, they happened to drift by the completely untouched Freden, reboarded and continued their journey. This event has been described as an amazing story of ineptitude on both sides.

On May 9, U-352 began the engagement that would end in its demise. Rathke spotted Icarus, a 165-foot USCG Cutter, on antisubmarine patrol off Cape Lookout. U-352 closed for an attack. Shortly before Rathke fired his torpedoes, Icarus got a sonar contact. Rathke fired at Icarus, but the torpedo either malfunctioned or hit the sea bottom.

Lieutenant Commander Maurice Jester aboard Icarus reacted appropriately. He sent out five depth charges from the Y-gun, which damaged U-352 so badly they decided to play dead and lay still on the bottom, hoping to go unnoticed. Jester began dropping depth charges systematically and eventually forced Rathke to surface. As the crew of U-352 prepared to scuttle, several began emerging from the conning tower preparing to jump overboard. Fearing that they may attempt to man their deck guns, Icarus began delivering heavy machine-gun fire, which resulted in the deaths of several crew aboard the U-boat.

prisoners being processed
U-352 prisoners being processed by U.S. Officials. Hellmut Rathke pictured second from left. Click here for a larger image. Photo: Courtesy of the National Archives

U-352 sank while the majority of the crew was able to escape. Icarus left the area for approximately an hour to await instructions on how to proceed. They then returned to the site and collected 33 survivors, one of which died aboard the Icarus shortly thereafter. The survivors of U-352 were later interrogated and remained in various prisoner of war camps for the duration of the war, often intermingling with survivors from U-701.

Site Plan

Site plan of U-352
Final archaeological site plan of U-352. Click here for a larger PDF image. Photo: NOAA

To view additional site plans click here.

Dive Slate


Click above to view a dive slate for U-352.

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