[Jimbuna]

IRL the odds were heavily stacked in favour of the aircraft.
Usually the best the Uboat could hope to achieve was to keep the aircraft at arms length until the sub got the chance to dive.
Often, the aircraft would call in assistance from surface or other airborne assets.
Remember, once the pressure hull was pierced, the sub was no longer capable of diving.
Over 250 Uboats were lost to aircraft during the war.