Always check the pool for a submarine. You'll never know if such incidents like that could happen.
But they weren't in a pool.
Uuuuuu... AaaaAAARrrrgHhhhHH~... hit by a submarine~Kyaaaaaaaa---!*KABOOOOOOOOOOOOOM*Are you okay?Ummm~ Getting a direct hit into the asshole by a torpedo is sure too harsh for a beginner~