[Juha]

Hello Brian
an insignificant friendly fire case and probably without fatal consequences but to confirm that one should check the sub’s log. But also probably fairy common case of friendly fire.

Sept. 3rd 1942 Blenheim P/404 [Sqn] “at 0852/PCTU 1448 attacked fully-surfaced submarine, co. 65, speed 8 knots. A/C ‘P’ dived to attack, and fired a burst of 6 secs from 700 yds. On approaching nearer, captain recognised marking on submarine as N78 or N73, and ceased fire at 300 yards. Submarine was unescorted, and made no recognition signal. Some hits were estimated on conning tower. Submarine submerged after attack. No adverse effects of attack were seen…“

Source: Sumburgh ORB. Form 540

BTW, RAF sunk a Soviet sub, ex-RN vessel turned to Soviets, on its way from GB to Murmansk. According to British investigation the sub was well outside its safety corridor when the attack happened. If You don’t have info on this I can dig out some details on it on naval side.

Juha