When titanic started sinking, many passengers were apprehensive to leave the Titanic at first, not believing that the ship was actually sinking, and a number of lifeboats left the vessel half-filled. Sinking she was, however, and at 2:30 a.m., April 15, the Titanic went down. Many passengers still on board had to jump into the freezing waters of the North Atlantic, while those in the lifeboats watched, helplessly, in shock. More than 1,500 passengers and crew lost their lives, mostly due to hypothermia.