U boats pointless?

[Khevenhuller]

Weren't a great many u-boats sunk by air attack by aircraft of RAF Coastal Command using bombs and depth charges, when they were on the surface or at periscope depth? A submarine isn't that hard to see from the air if it's only at periscope depth.

Indeed. Aircraft are the best ASW platform, particularly when they get radar. Escorts sank some, but were often far more effective by simply keeping the Sub down, spoiling any positioning and reducing overall endurance.

K