U-505 conducted twelve patrols, sinking eight ships totaling of 44,962 tons -- three American, two British, and one each Norwegian, Netherlands, and Colombian.
On November 10, 1942, the second watch officer and one lookout were seriously wounded in an air attack by an Hudson aircraft from the 53th Squadron RAF. That aircraft was shot down in that attack, but the boat was damaged heavily and headed back. Twelve days later the wounded watch officer was transferred to the milchkuh U-462.
On October 24, 1943, Kptlt. Peter Zschech, while in command of U-505 and under a heavy depth charge attack, committed suicide, the only such incident in the war. The first watch officer, Oblt. Paul Meyer, saved the boat and brought it back to port.
On June 4, 1944, United States Navy task force 22.3 captured U-505, the first time a US Navy vessel had captured an enemy at sea since 1815 when USS Peacock seized HMS Nautilus during the War of 1812.
The action took place in the Atlantic Ocean, at 21°30'N, 19°20'W, about 150 miles off the coast of Rio De Oro, Africa. The American force was commanded by Captain Daniel V. Gallery, USN, and comprised the escort aircraft carrier Guadalcanal (CVE-60), and five destroyers under Commander Frederick S. Hall, USN: Pillsbury (DE-133), Pope (DE-134), Flaherty (DE-135), Chatelain (DE-149), and Jenks (DE-665).
Alerted by Allied cryptanalysts, who had decrypted the German naval code "Shark", the Guadalcanal task group knew U-boats were operating off the African coast near Cape Verde. They did not know the precise location, however, because the coordinates in the message were encoded separately before being enciphered for transmission. By using high-frequency direction finding fixes (HF/DF, pronounced "huff-duff") and air and surface reconnaissance, the Allies could narrow down a U-boat's location. The Guadalcanal task group intended to use all these methods to find and capture the next U-boat they detected.
The task group sailed from Norfolk, Virginia, on May 15, 1944, for an anti-submarine patrol near the Canary Islands. For two weeks they searched unsuccessfully, steaming as far south as Freetown, Sierra Leone. On Sunday, June 4, 1944, with fuel running low, the warships reluctantly turned north and headed for Casablanca. Ten minutes later, at 1109, Chatelain (DE-149), Lieutenant Commander Dudley S. Knox, USNR, made sonar contact on an object just 800 yards away on her starboard bow. Guadalcanal immediately swung clear at top speed to avoid getting in the way, as Chatelain and the other escorts closed the position.
In the minutes required to identify the contact definitely as a submarine, however, Chatalain closed too rapidly and could not attack -- her depth charges would not sink fast enough to intercept the U-boat. The escort held her fire, opened range and set up an attack with her "hedgehog" battery. Regaining sonar contact after a momentary loss due to the short range, Chatelain passed beyond the submarine and swung around toward it to make a second attack with depth charges.
As the ship heeled over in her tight turn, one of two FM-2 Wildcat fighter planes launched overhead by Guadalcanal, sighted the submerged U-boat and dived on it, firing into the water to mark the submarine's position. Chatelain steadied up on her sound bearing and moved in for the kill. A full pattern of depth charges set for a shallow target splashed into the water around the U-boat. As their detonations threw geysers of spray into the air, a large oil slick spread on the water; the fighter plane overhead radioed "You struck oil! Sub is surfacing!" Six and one-half minutes after Chatelain's first attack, U-505 broke the surface with its rudder jammed, lights and electrical machinery out, and water coming in.
As the submarine broached only 700 yards from Chatelain, the escort opened fire with all automatic weapons that would bear and swept the U-boat's decks. Pillsbury, Lieutenant George W. Casselman, USNR, and Jenks, Lieutenant Commander Julius F. Way, USN, farther away, and the two "Wildcats" overhead all joined the shooting and added to the intense barrage. Wounded in the torrent of fire and believing that his submarine had been mortally damaged by Chatelain's depth charges, the commanding officer of U-505 quickly ordered his crew to abandon ship. So quickly was this command obeyed that scuttling measures were left incomplete and the submarine's engines continued to run.
The jammed rudder caused the partially-submerged U-505 to circle to the right at a speed near seven knots. Seeing the U-boat turning toward him, the commanding officer of Chatelain ordered a single torpedo fired at the submarine in order to forestall what appeared to be a similar attack on himself. The torpedo passed ahead of U-505, which by now appeared to be completely abandoned. About two minutes later, the escort division commander ordered cease fire and called away Pillsbury's boarding party.
While Chatelain and Jenks picked up survivors, Pillsbury sent its motor whaleboat to the circling submarine where Lieutenant (junior grade) Albert David led the eight-man party on board. Despite the probability of U-505 sinking or blowing up at any minute and not knowing what form of resistance they might meet below, David and his men clambered up the conning tower and then down the hatches into the boat itself. After a quick examination proved the U-boat was completely deserted (except for one dead man on deck -- the only fatality of the action), the boarders set about bundling up charts, code books, and papers, disconnecting demolition charges, closing valves, and plugging leaks. By the time the flood of water had been stopped, the U-boat was low in the water and down by the stern.
Meanwhile, Pillsbury twice went alongside the turning submarine to put over tow lines and each time the escort's side was pierced by the U-boat's bow plane. Finally, with three compartments flooded, she was forced to haul clear to attend to her own damage. The boarding party was then reinforced by a party from Guadalcanal. Led by Commander Earl Trosino, USNR, the carrier's men completed temporary salvage measures, and took a towline from Guadalcanal. The salvage crew was later joined by Commander Colby G. Rucker, USN, who arrived with the seaplane tender Humbolt (AVP-21).
In an ingenious solution to the heavy flooding, the salvage crew disconnected the boat's diesels from her motors. This allowed the propellers to turn the shafts while under tow. After setting the main switches to charge the batteries, Guadalcanal towed the U-boat at high speed, turning the electric motors over which recharged the boat's batteries. With power restored, the salvage crew could use the U-boat's own pumps and air compressors to finish pumping out seawater and bring her up to full surface trim.
After three days of towing, Guadalcanal was relieved of her burden by the fleet tug Abnaki (ATF-96). Arriving with the tug was the tanker Kennebec (AO-36), sent to provide much-needed fuel to the task group. On Monday, June 19, 1944, U-505 was brought into Port Royal Bay, Bermuda, after a tow of 1700 miles. U-505 was kept there in secrecy until the end of World War II.
The capture of codebooks on U-505 allowed American cryptanalysts to occasionally break the special "coordinate" code in enciphered German messages and determine more precise locations for U-boat operating areas. In addition to vectoring in hunter-killer task groups on these locations, these coordinates enabled Allied convoy commanders to route shipping away from known U-boat locations, greatly inhibiting the effectiveness of German submarine patrols.
Fifty-eight prisoners had been taken from the water during the action. One man had been killed and three (the commanding officer, executive officer, and one enlisted man of the U-boat) wounded. Lieutenant (jg) David's part in saving the abandoned submarine earned the Medal of Honor; Torpedoman's Mate Third Class A. Knispel and Radioman Second Class S.E. Wdowiak each received the Navy Cross; and Commander Trosino received the Legion of Merit. The task group itself was awarded the Presidential Unit Citation. Admiral Royal E. Ingersoll, Commander in Chief, U.S. Atlantic Fleet, cited the Task Group as follows:
In 1946, however, Father John Gallery learned of this plan from his brother, then-Admiral Daniel Gallery, and called the Chicago Museum of Science and Industry (MSI) President Lenox Lohr to see if MSI would have an interest in saving U-505. The museum, established by Chicago businessman Julius Rosenwald as a center for "industrial enlightenment" and public science education, specialized in interactive exhibits, not just view displays and artifacts. Lohr immediately revealed 10-year-old plans to include a submarine in the exhibits of the museum and began a plan to bring U-505 to Chicago.
The people of Chicago raised US$250,000 to help prepare the boat for the tow and installation at the museum. In September 1954, U-505 was donated to Chicago at no cost to the U.S. Government. On September 25, 1954, U-505 was dedicated as a war memorial and as a permanent exhibit. In 1989, U-505, the only Type IXC still in existence, was designated a National Historic Landmark.
The museum maintains a Web page on U-505 at http://www.msichicago.org/exhibit/U505/U505home.html .