R.M.S Titanic on Instagram: "This video is the only authentic footage of the RMS Titanic, filmed in Belfast in 1912, before the ship officially entered service. It shows the Titanic at the dock during the stage when the final details were still being completed. A key detail is that A Deck is still open, which has led some people to mistake this footage for the RMS Olympic. Later, that deck was closed as an improvement after passengers had complained about the open deck on the Olympic. This foota