At 2:20 a.m. on April 15, 1912, the "unsinkable" R.M.S. Titanic disappeared beneath the waves, taking with her 1,500 souls. New technologies now reveal the most complete--and most intimate--images of the famous wreck. More photos and the complete story are in the April 2012 issue of National Geographic . (© 2012 RMS TITANIC, INC; Produced by AIVL, Woods Hole Oceanographic Institute. Modeling by Stefan Fichtel)