The Titanic is the iconic symbol of disaster. It was considered to be unsinkable despite obvious design flaws that were only admitted retrospectively.
=== Titanic’s sister ship Sister Ship the Britannic ===
The example of Titanic’s sister ship the Britannic, is instructive. She was launched after Titanic and incorporated in her design many lessons learned from Titanic, including watertight bulkheads. In World War I, she hit a mine off the coast of Greece. She went down in five minutes – faster than the Titanic.<ref>http://www.webtitanic.net/frameBritannica.html</ref>