One of history's greatest whodunnits may have finally been solved with the appearance of a photo depicting the iceberg the Titanic could have hit.
An American auction house is selling a black-and-white picture of an iceberg taken by the captain of the SS Etonian two days before the sinking of the Titanic.
Experts say it is more likely than any other photo yet found to depict the deadly iceberg, the Daily Mail reported.
RR Auction in Amherst, New Hampshire, is hoping to sell the "amazing and extremely rare" photograph for up to US$10,000 next month, along with 408 other Titanic memorabilia items.
The photo in question shows a large iceberg with a distinctive elliptical shape and is captioned in black ink by Captain Wood: "Copyright. Blue berg taken by Captain W F Wood SS Etonian on 12/4/12 in Lat 41° 50 W Long 49° 50 N. Titanic struck 14/4/12 and sank in three hours."
Frederick Fleet, the Titanic lookout on duty who first spotted the iceberg, and Joseph Scarrott, an able-bodied seaman, each drew sketches of the iceberg that strongly resemble the one in this photo.
The fact that the iceberg in the Etonian image offered here is known to have been photographed at a position arguably 2-3 days' iceberg travel time to Titanic's foundering position makes it more likely than any other pictures yet discovered to depict the iceberg that sunk the "unsinkable" ship on April 15, 1912, killing 1502 people.
"In my professional judgement this iceberg is the one that sunk the Titanic," Titanic expert Stanley Lehrer told the Daily Mail.
"Within the past two years, I discovered a photograph that had been taken by Captain Wood of the SS Etonian on April 12, 1912.
"The captain took the pictures because he was fascinated with the unusual shape of the iceberg."