Question: who discovered the titanic wreck site and when

title: Wreck of the RMS Titanic
text: Ballard realized that looking for the wreck itself using sonar was unlikely to be successful and adopted a different tactic , drawing on the experience of the surveys of Thresher and Scorpion ; he would look for the debris field instead , using Argo 's cameras rather than sonar . Whereas sonar could not distinguish man - made debris on the sea bed from natural objects , cameras could . The debris field would also be a far bigger target , stretching a mile ( 1.6 km ) or longer , whereas Titanic itself was only 90 feet ( 27 m ) wide . The search required round - the - clock towing of Argo back and forth above the sea bed , with shifts of watchers aboard the research vessel Knorr looking at the camera pictures for any sign of debris . After a week of fruitless searching , at 12.48 am on Sunday 1 September 1985 pieces of debris began to appear on Knorr 's screens . One of them was identified as a boiler , identical to those shown in pictures from 1911 . The following day , the main part of the wreck was found and Argo sent back the first pictures of Titanic since her sinking 73 years before . The discovery made headlines around the world . 

Answer: answer: Ballard realized that looking for the wreck itself using sonar was unlikely to be successful, he would look for the debris field instead, using Argo's cameras rather than sonar.  At 12.48 am on Sunday 1 September 1985 pieces of debris began to appear on the research vessel Knorr's screens, and the following day, the main part of the wreck was found.
answer: Ballard realized that looking for the wreck itself using sonar was unlikely to be successful, he would look for the debris field instead, using Argo's cameras rather than sonar. At 12.48 am on Sunday 1 September 1985 pieces of debris began to appear on the Knorr's screens, and the following day, the main part of the wreck was found.