At least five separate boards of inquiry on both sides of the Atlantic conducted comprehensive hearings on Titanic’s sinking, interviewing dozens of witnesses and consulting with many maritime experts. Every conceivable subject was investigated, from the conduct of the officers and crew to the construction of the ship. While it has always been assumed that the ship sank as a result of the gash that caused the compartments to flood, various other theories have emerged over the decades, including that the ship’s steel plates were too brittle for the near-freezing Atlantic waters, that the impact caused rivets to pop and that the expansion joints failed, among others.