"The Titanic’s distress signal placed the Titanic at 41°46’N, 50° 14’ west. Part of the British Enquiry was to ascertain if this was exact. It concluded that the position given was slightly inaccurate as the Carpathia, who raced to the Titanic’s rescue, reached the lifeboats before they should have done if the position was accurate. (…)
A new search strategy was formed. This time they would first look for the debris field rather than the Titanic herself.
The logbook of the Californian enabled Ballard and his crew to estimate the speed and direction of drift of the lifeboats. The Californian was between five to ten miles away from the Titanic at the time of the disaster and reported in its log that they had experienced drift. Also Ballard knew that the Titanic had to be north of where the lifeboats were found.
On August 24 1985 Ballard returned to the vicinity of the Titanic. He had 12 days to locate the wreck. Argo was launched the next day but encountered technical problems. After another six days, the crew was fed up with the monotony of observing sand, mud and the bottomless ocean.” (x)
"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.
”(…)Eventually at an altitude of 160 feet above the bed, Argo passed over the main hull of the ship. They could see that the funnel had gone (the one which Lightoller recalled saved his life when it tore out of its fixtures moments before the ship went down).
Their first look at the Titanic lasted six minutes: she was upright and a large section of her hull was intact. She laid 13,000 feet below the surface.
Following much the cheering and clapping, reverential silence overcame the crew of the Knorr. It was almost 2 a.m. and very close to the time when the Titanic actually sank.” (x