Japan's Cruise Ship Diamond Princess Quarantine (2020)

The Diamond Princess quarantine in Yokohama harbor initially infected 3,711 passengers, but a catastrophic lack of infection control turned the ship into a floating incubator, ultimately causing over 700 infections and 14 deaths. Infectious disease expert Kentaro Iwata's viral video exposed the chaotic conditions—patients mingling with the healthy—triggering global condemnation.