01.05.43
Kriegsmarine’s Oberkommando der Marine records a total of 134 submarines at sea.
02.05.43
U465 sunk north-west of Cape Ortegal, by an RAAF Sunderland.
04.05.43
U109 intercepted on the surface transiting south-west of Ireland by a Liberator of 89 Squadron.
U439 and U659 collide west of Cape Finisterre, with the loss of 84 crew from both boats.
05.05.43
U638 depth-charged and sunk