What where the tianics distress signals before SOS?

Before the adoption of the SOS distress signal, the Titanic used the Morse Code distress signal "CQD," which stands for "All stations, distress," to call for help. The ship's operators also sent out flares and used the ship's whistles to signal for assistance. The Titanic's last distress signal was a combination of CQD and SOS, as operators were transitioning to the new SOS signal when the disaster struck.