RMS Titanic was a passenger liner that sank in the North Atlantic Ocean on 15 April 1912 after colliding with an iceberg during her maiden voyage from Southampton, England to New York City. The sinking of Titanic caused the deaths of 1,514 people in one of the deadliest peacetime maritime disasters in history. She was the largest ship afloat at the time of her maiden voyage. One of three Olympic class ocean liners operated by the White Star Line, she was built between 1909–11 by the Harland and Wolff shipyard in Belfast. She carried 2,224 people. From Wikipedia
Diigo list of Titanic resources
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The New York Times blogs have a huge list of resources for teachers about Titanic and the sinking in April 1912. There are links to primary sources in the form of photos, diary pages, and newspaper accounts. There is an eyewitness account from the NY Times, who interviewed the wireless operator of Titanic after the tragedy.
The website Eyewitness to History has a page on the Titanic, which includes newspapers and eyewitness testimony.
The ship itself was found in 1985. Read the account from the NY Times about that discovery.
Titanic in the Classroom was recreated by students from an Australian site of the same name. They have a huge database, biographical sketches, science experiments on buoyancy, charts and graphs --- just, in general, a huge amount of information about how to incorporate the study of Titanic across the curriculum.
HistoryTech has a great list of iPad apps on Titanic (I have to go find those!), lesson plans, and websites that offer teachers a deeper look into the ship and the tragedy.
The British National Archives has lesson ideas with primary source analysis on "Life Aboard the Titanic".
The Library of Congress has lesson ideas using primary sources but looking at the shifts over time in theories on the sinking.
And the BBC has "Ticket to Launch Titanic", which includes primary source documents, photographs, and a few video clips using eyewitness testimony and photographs.