Documentary about the iceberg that sank the Titanic on April 14, 1912 More than just a giant ice cube in search of a gin and tonic, every iceberg is unique, molded by its ocean journey as it splits, fractures and melts each day. But where do they come from and, more particularly, what were the origins of the iceberg that sealed the fate of the Titanic in April 1912? According to this exquisitely shot documentary, which is a cross between a nature program and a whodunit, the fatal iceberg most likely began as a snowflake that fell in Greenland more than 100,000 years ago. It gradually formed part of a vast glacier before breaking away to become what is known as a mega berg. There are eerie pictures of scientists exploring the tunnels inside icebergs, historic film of the Titanic being constructed and astonishing contemporary footage of a giant iceberg tipping near the fishing village of Ilulissat and the resulting tsunami.