Wreck of the Titanic |How titanic explored ? |Mlife Daily | BS Chandra Mohan

The Navy commissioned Ballard and his team to carry out a month-long expedition every year for four years, to keep Argo / Jason in good working condition.
It agreed to Ballard's proposal to use some of the time to search for the Titanic once the Navy's objectives had been met; the search would provide an ideal opportunity to test Argo / Jason.
In 1984 the Navy sent Ballard and Argo to map the wrecks of the sunken nuclear submarines USS Thresher and USS Scorpion, lost in the North Atlantic at depths of up to 9,800 ft (3,000 m).
The expedition found the submarines and made an important discovery about how shipwrecks behave as they sink.
As Thresher and Scorpion sank, debris spilled out from them across a wide area of the seabed and was sorted by the currents, so that light debris drifted furthest away from the site of the sinking. This debris field was far larger than the wrecks themselves.
A second expedition to map the wreck of Scorpion was mounted in 1985. Only twelve days of search time would be left at the end of the expedition to look for the Titanic.
As Harris/Grimm's unsuccessful efforts had taken more than forty days, Ballard decided that extra help would be needed. He approached the French national oceanographic agency, IFREMER, with which Woods Hole had previously collaborated. The agency had recently developed a high-resolution side-scan sonar called SAR and agreed to send a research vessel, Le Suroît, to survey the sea bed in the area where the Titanic was believed to lie. The idea was for the French to use the sonar to find likely targets, and then for the Americans to use Argo to check out the targets and hopefully confirm whether they were in fact the wrec
The French team spent five weeks, from 5 July to 12 August 1985, "mowing the lawn" - sailing back and forth across the 150-square-nautical-mile (510-square-kilometre) target area to scan the sea bed in a series of stripes. However, they found nothing; though it turned out that they had passed within a few hundred yards of the Titanic in their first run.
Ballard realised 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. While sonar could not distinguish human-made debris on the sea bed from natural objects, cameras could. The debris field would also be a far bigger target, stretching one nautical mile (1.9 kilometres) or longer, whereas the 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.[38] The following day, the main part of the wreck was found and Argo sent back the first pictures of the Titanic since her sinking 73 years before.
The discovery made headlines around the world.
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