English: Oblique aerial photograph taken from Short Sunderland Mark III, EK586 'U', of No. 10 Squadron RAAF during an attack on German type VIIC submarine U 426 in the Bay of Biscay. During a midwinter 'Percussion' patrol in the Bay of Biscay, Sunderland 'U' of 10 Squadron RAAF spotted the German submarine U 426, outward bound at a distance of 12 miles in excellent visibility. Confidently remaining on the surface, U-426 opened fire at five miles with its daunting armament of an automatic 30mm gun and 4x20mm cannon. Flying Officer J. P. Roberts, piloting the Sunderland, closed to 1,200 yards and hosed the U-boat's gun platforms with his four fixed bow-mounted machine guns (a new armament devised by the Australians for the Sunderland). This caused chaos on the U-426 bridge. The boat was unable to further defend itself and Roberts pressed home a depth-charge attack. U 426 was holed at the rear. The crew abandoned the rapidly sinking boat, but none of them were to survive the exposure to the winter conditions.