CNN National Correspondent Randi Kaye investigates this story that has rapidly captured the world's attention. On June 18, 2023, five passengers on the Titan submersible dived 13,000 feet to view the Titanic on the ocean floor and perished in a "catastrophic implosion," authorities said Thursday, June 22. This bookended an astounding five-day international search operation near the site of the world's most famous shipwreck. Kaye unravels the timeline of events, starting with the Titan's initial descent and their last communication to the surface. As investigators continue to scour the ocean floor for debris trying to establish the circumstances of the Titan's fatal final voyage, Kaye breaks down everything we know now.This episode features interviews with the foremost experts on submersible travel and people close to the passengers, including OceanGate Expeditions investor Aaron Newman, Expedition: Unknown host Josh Gates, CEO of Underwater Forensic Investigators Tom Maddox, senior adviser for strategic initiatives for RMS Titanic Inc. David Gallo, and CBS Correspondent David Pogue.