Olympic-class ocean liner
When "Titanic" sank in 1912 and "Britannic" sank in 1916, their sinkings did not receive the same attention, due to the death toll (1,517 on "Titanic" and 30 on "Britannic"). Because the exact position of the sinking of the "Britannic" is known and the location is shallow, the wreck was discovered relatively easily in 1975. "Titanic", however, drew everyone's attention in 1912. After several attempts, the wreck was finally located by Jean-Louis Michel of Ifremer and Robert Ballard following a top secret mission for the US Navy to investigate the wreckage of two nuclear submarines, USS Thresher (SSN-593) and the USS Scorpion (SSN-589), that sank in the North Atlantic in the 1960s. The discovery of the wreck occurred on 1 September 1985, at 25 kilometres from the position given of the sinking. The wreck lies about 4,000 metres deep, broken in two. The bow is relatively well preserved, but the stern partially imploded, and to a large extent disintegrated during the descent and impact on the seabed.
Sinking of the RMS Titanic
"Titanic"s surviving officers and some prominent survivors testified that the ship had sunk in one piece, a belief that was affirmed by the British and American inquiries into the disaster. Archibald Gracie, who was on the promenade deck with the band (by the second funnel), stated that ""Titanic"s decks were intact at the time she sank, and when I sank with her, there was over seven-sixteenths of the ship already under water, and there was no indication then of any impending break of the deck or ship". Ballard argued that many other survivors' accounts indicated that the ship had broken in two as it was sinking. As the engines are now known to have stayed in place along with most of the boilers, the "great noise" heard by witnesses and the momentary settling of the stern were presumably caused by the break-up of the ship rather than the loosening of her fittings or boiler explosions.