[bigboywooly]

@ Viper

Possibly
Maybe the torpedo charge was weak on that fish

Shortly after dawn one morning, Looks sighted the Second Support Group through his periscope. As the sloops passed, he fired a torpedo in the general direction of the nearest - Starling. On the sloop's bridge, Walker spun around at an excited shout from a lookout to see the track of the torpedo approaching his stern, homing on the propellers. There was no time to increase speed or to take violent avoiding action. His mind raced.
Starling was doomed. With eyes fixed on the line of bubbles, he rapped out orders: "Hard aport....Stand by depth charges....Shallow setting....Fire." Suddenly the air was rent by two almost simultaneous shattering roars. The first came from the depth charges and the second, from the torpedo, which had gone off 5 yards from the sloop's quarterdeck. The depth charges had countermined the torpedo a second before it struck.



This was an actual photo of the depth charges being set to "shallow" as the torpedo homed in

http://www.mikekemble.com/ww2/walker.html