Emergency communication system
When Hurricane Katrina, a Category 5 hurricane, hit New Orleans, the emergency communications systems were completely destroyed, including power stations, internet servers, mobile phone towers, and 911 services. The Federal relief workers' satellite telephones could not work with other devices, even when they did work. A few AM radio stations were able to continue broadcasting throughout the storm.  WWL, a radio station, remained working by broadcasting from a closet. Amateur radio was very important in the rescue process and worked well when 911 communications were damaged or not working.