The Titanic Mod for Mafia: The City of Lost Heaven aims to put the RMS Titanic in Mafia - the team is working towards making "one of the most detailed and accurate free 3D recreations of the Titanic ever made", with players able to explore the ship in freeroam mode.
Emma reported on the mod in July, speaking with lead developer and maritime engineer from the Netherlands, Robin Bongaarts. Bongaarts has been working on the project since September 2006, and finally now a portion of it has been released.
It's worth noting part one does not include the sinking of the Titanic. This is planned for a later release. Nor does it include a fully-fleshed out storyline, or the full interior of the ship itself.