Macabre Knowledge on Instagram: "On August 14, 2005, the world witnessed one of aviation’s most haunting tragedies when Helios Airways Flight 522 left Cyprus for Prague and slowly turned into what would later be called a ghost aircraft. Because the pressurization system had not been set correctly, everyone on board—pilots, crew, and passengers—was gradually overcome by hypoxia, slipping into confusion and then unconsciousness as the cabin lost oxygen. The plane continued flying silently on autop