U-Boat Operations

U-645	Type VIIC
Feldpost Number	M 49 700
Construction Yard	Blohm und Voß, Hamburg
Yard Number	621
Ordered	20th Jan 1941
Keel laid	17th Dec 1941
Launched	3rd Sep 1942
Commissioned	22nd Oct 1942
Baubelehrung	8.KLA, Hamburg
Training, Flotillas and Duties
10.42 - 04.43	5.U-Flottille, Kiel Ausbildungsboot (under training)
05.43 - 12.43	3.U-Flottille, La Pallice Frontboot (operational)
Commanders
10.42 - 12.43	LT Otto Ferro

Operations information for U-645
24.04.1943 - 22.06.1943 First Sailing - active patrol U-645 left Kiel under the command of Otto Ferro on 24th Apr 1943 and arrived at Brest on 22nd Jun 1943 after eight and a half weeks. At 1500 HRS on 6th May 1943 in square AL 23, U-645 came under attack from an unidentified aircraft. At 1603 HRS on 19th May 1943 in square AK 54, U-645 came under attack from an aircraft of RAF 120 Squadron. At 0306 HRS on 21st May 1943 in square AK 64, U-645 came under attack from an unidentified aircraft. At 1300 HRS on 12th Jun 1943 in square BD 36, U-645 came under attack from an aircraft of RAF 86 Squadron. U-645 was only slightly damaged in the attack. The boat defended itself with flak without destroying the aircraft. At 1623 HRS on 12th Jun 1943 in square BE 14, U-645 came under attack from an aircraft of RAF 86 Squadron. The boat defended itself with flak without destroying the aircraft. On 18th Jun 1943 in square BE 92, U-645 came under attack from an aircraft of RAF 59 Squadron. The boat defended itself with flak without destroying the aircraft. On 19th Jun 1943 in square BE 93, U-645 came under attack from an aircraft of RAF 236+248 Squadron.
23.08.1943 - 21.10.1943 Second Sailing - active patrol On the 23rd Aug 1943, U-645 left Brest under the command of Otto Ferro and after eight and a half weeks arrived at La Pallice on 21st Oct 1943. Otto Ferro hit two ships on this patrol and both of them were in convoy: One was from convoy ON-202 and one was from convoy SC-143. On 20th Sep 1943 he sank the American 7,176 ton Frederick Douglass, sailing with convoy ON-202. On 9th Oct 1943 he sank the American 5,612 ton Yorkmar, a member of convoy SC-143.
02.12.1943 - 24.12.1943 Third Sailing - active patrol U-645 departed under Otto Ferro from La Pallice on 2nd Dec 1943. The boat was sunk on 24th Dec 1943.

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