SACHET Emergency Alert System: How SACHET Emergency Alert System is Transforming Disaster Communication in India

SACHET Emergency Alert System Latest News

• India has introduced the SACHET Cell Broadcast system, an indigenous emergency messaging service designed to deliver instant alerts to citizens during crises such as natural disasters, wars, or other emergencies. 
• As part of testing, the government sent a nationwide notification with a siren sound, clarifying that no action was required as it was only a test message.
• The initiative aims to strengthen India’s disaster response framework by ensuring timely alerts, thereby enhancing public safety and building a more resilient communication ecosystem.

SACHET: India’s Integrated Emergency Alert System

• SACHET (meaning “alert”) is an Integrated Alert System designed to deliver disaster and emergency warnings directly to mobile users in geo-targeted areas via SMS.

Institutional Framework

• Launched by the Department of Telecommunications (DoT)
• Developed in collaboration with the National Disaster Management Authority (NDMA) 
• Aims to strengthen real-time disaster communication across India

Purpose and Scope

• Provides timely alerts during: 
  • Natural disasters (cyclones, earthquakes, floods) 
  • Man-made emergencies (gas leaks, chemical hazards, wars) 
• Ensures rapid dissemination of critical information to citizens

How the System Works

• Uses cellular network towers to broadcast alerts
• Works as a one-way communication system
• Does not require internet connectivity
• Can deliver messages to billions of users within seconds (if connected to network)
• Alerts can be nationwide or location-specific

Coverage and Reach

• Operational across all 36 States and Union Territories
• Has delivered over 134 billion SMS alerts
• Supports communication in 19 Indian languages

Test Use in India

• Around 11:40 AM on May 2, 2026, smartphones across India emitted a loud alert sound with vibrations and a pop-up message titled “extremely severe alert”, as part of a nationwide test of the cell broadcast system.
• Similar systems are already used in countries like Japan for tsunami and disaster warnings.
• India’s recent test marks one of the largest-scale implementations of this technology.

Significance

• Enhances disaster preparedness and response 
  • Under the UN’s “Early Warnings for All” initiative, which International Telecommunication Union (ITU) helps implement, cell broadcast is seen as a key tool to ensure people receive timely, accurate alerts.
• Improves last-mile connectivity of emergency alerts
• Builds a more resilient and responsive public communication system in India

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Cell Broadcast Technology: A Powerful Tool for Emergency Alerts

• Cell Broadcast is a communication method that enables authorities to send short messages simultaneously to multiple mobile phones within a specific geographic area.
• It can target either a large population or a limited set of users in a hazard-affected zone, ensuring precise and efficient dissemination of alerts.
• A major advantage of cell broadcast technology is its ability to bypass network congestion, allowing messages to be delivered instantly even during peak traffic conditions.
• It does not rely on internet connectivity and can be customised based on user preferences such as language, making it highly effective for mass communication.

Origin and Global Adoption

• Developed in the early 1990s by the European Telecommunications Standards Institute and first demonstrated in Paris in 1997, the technology has since been adopted globally.
• Today, it is used by over 30 countries as a best practice for issuing timely warnings during natural disasters.

How Cell Broadcast Technology Works

• Cell broadcast operates through the routine communication between mobile network towers and phones within their coverage area. 
• These towers continuously transmit network-related information to connected devices, which usually remains invisible to users.
• Authorities utilise this existing one-way communication system to send emergency alerts. 
• Instead of relying on individual messaging, the system enables a single alert to be transmitted from a cell tower to all connected devices simultaneously.
• By broadcasting one message to multiple users at once, cell broadcast ensures instant, wide-scale delivery without network congestion, making it highly effective for real-time alerts during disasters and emergencies.

Cell Broadcast vs SMS: Key Differences

• So far, India relied on an SMS-based disaster alert system operational across all 36 States and Union Territories.
• Now it has developed cell broadcast technology as a more advanced alert mechanism.
  • It is not clear when the full rollout of this technology will take place.
• Cell Broadcast (CB) is a one-to-many system, allowing a single message to reach millions of devices simultaneously, whereas SMS operates on a one-to-one basis, sending messages individually to each recipient.
• CB sends alerts through specific cell towers, targeting users within a geographic area. 
  • Unlike SMS, it does not require phone numbers, enabling precise, location-specific messaging without tracking individuals.
• Cell Broadcast is more privacy-friendly, as it does not rely on user data. It can also reach visitors and foreign users in the area, often delivering messages in multiple languages.
• CB alerts are highly conspicuous, featuring loud sounds and pop-ups, making them difficult to ignore. In contrast, SMS messages can be missed or overlooked more easily.

Source: IE | PIB | IE