Frederick Fleet, who survived the Titanic sinking, called down and said, “Iceberg dead ahead.” How It Really Happened with Jesse L. Martin investigates the Titanic in a special two-hour episode Sunday at 9p ET/PT on CNN. | CNN Original Series

As the last lifeboat left the side of Titanic, there were tragically 1,500 souls remaining on the ship. How It Really Happened with Jesse L. Martin investigates the Titanic in a special two-hour episode - Sunday at 9p ET/PT on CNN. | CNN Original Series

She reluctantly spent her spring break volunteering at a homeless shelter. The connection she made with one young child there inspired her to help thousands find permanent housing. Get the full story on CNN Hero Brandi Tuck and Path Home: https://bit.ly/3J5itI1 | CNN Heroes

She transformed buses into mobile classrooms that have served thousands of migrant children living in limbo. Get the full story on CNN Hero Estefanía Rebellón and YES WE CAN: https://bit.ly/45qdJol | CNN Heroes