I have seen it only once, about one year ago, while playing GWX 1.0, I was patrolling the sealanes between Spain and the Azores. It was in the middle of a northbound SL convoy. Unfortunately, before placing myself for the attack, a plane spotted my periscope

and attacked me with a well placed depthcharge

that destroyed my entire conning tower forcing me to abort the attack

!
Now,my question was: Did someone ever managed to sent this bad girl to the cold bottoms?
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"A hard drill makes an easy battle" Alexander V. Suvorov
"When we realized that our clubbing and kickings were being administered by the burned, mutilated survivors of our handiwork, we found we could take it with less prejudice." Captain Richard "Dick" O'Kane-USS Tang
http://www.youtube.com/user/willembrock