A letter written on board the Titanic hours before the ship sank is set to go under the hammer. The letter is expected to fetch a whopping 100,000 pounds at an auction, says a report from London. The letter was written on Titanic stationery on Sunday, April 14, 1912, the day the liner collided with an iceberg, resulting in the loss of over 1500 lives. "The letter is probably the most important Titanic letter known today as it is the only letter written on April 14, 1912, to have survived," Andrew Aldridge of Auctioneers Henry Aldridge and Son said.