OK BrokenArrowTiger... what do you mean, "how they found O-19?" The were sent there by the Commander of TF 91 to aid the Allied sub. I am probably about the best source of info on this subject on this side of the Atlantic (outside of the Dutch Onderseedeinst Tradikamer... what do you want to know about the rescue? You can read my 5,000-word article one the rescue mission in one of the more recent issues of World War II magazine, look for the cover with General Patton's face.