Wednesday, September 30, 1998 Published at 15:31 GMT 16:31 UK
The sinking of the Britannic
The Britannic was supposed to have been unsinkable like its carbon copy sister
One-tenth larger than her more famous sibling, the Britannic which served as a hospital ship in World War One launched from Belfast in 1914.
But the luxury liner, which was requisitioned before its maiden voyage by the UK Government, went down in just 57 minutes, more than three hours faster than the Titanic.
Around 30 people died and 1,000 survived when the ship went down in 1916 off the Greek coast.
For many years, historians have argued whether the ship was hit by a torpedo or struck by a mine.
The reason why the Britannic sank in the Aegean Sea remains unresolved, but new findings have shed new light on the mystery.
An international team of divers who have been exploring the wreck have formulated different opinions and have found no evidence to suggest she was torpedoed.
"I think it probably did hit a mine," said expedition leader Nick Hope. "But to conclusively prove that it did, you would have to find the anchor chain on the sea-bed."
Wartime claims that the hospital ship was secretly transporting arms were also laid to rest.
"The Germans would have claimed for war propaganda reasons that the ship might have been transporting illegal weapons, but the divers have not found anything."
The first ever full-scale survey of the Britannic took place last year.
The ship's immense wooden deck, doors and storage rooms were found to be totally intact, although its furniture had perished.