I talked to a former navy submariner today about this. He told me the chances of actually hitting a whale are very dismal. He said even if you were to go straight towards said whale, the force of the water being pushed around the sub by its forward thrust would move the whale. (sorry i couldnt explain this better, i forgot all the big words he used today) He also said if the sub actually did somehow collide with the whale it would be dead in seconds and in his time in the navy he did hit a few large animals. And while he said it was scary as shit, ultimately nothing on the sub was damaged and the animal was dead. Last he said because of the subs sonar you’d see the whale coming from quite a distance so avoiding it all together wasnt a difficult task.