Case Studies

Real-world examples of communication resilience — and failure — during major events.

Hurricane Maria (Puerto Rico, 2017)

One of the most complete communication blackouts in US history. 95% of cell sites went down. Landlines failed. Internet was gone for months in many areas.

What worked:

• Amateur radio operators maintained communication for weeks
• Mesh networks were rapidly deployed in some communities
• Satellite phones provided critical links for emergency coordinators

What failed:

• Cell towers lacked fuel for generators after initial battery backup died
• Centralized infrastructure had no geographic redundancy
• Commercial satellite capacity was overwhelmed

2003 Northeast Blackout

The largest blackout in North American history affected 55 million people. Most cell towers failed within hours as batteries drained.

Key finding: Amateur radio nets maintained communication across the affected region throughout the event, coordinating emergency services when all other systems failed.

Tohoku Earthquake & Tsunami (Japan, 2011)

Despite Japan's advanced infrastructure, the disaster destroyed communication systems across a wide area.

What worked:

• NTT's disaster message dial service
• Amateur radio emergency networks (JARL)
• Twitter and social media (where internet survived)

What failed:

• Cell networks overloaded immediately
• Physical infrastructure destroyed in tsunami zones

Common Patterns

Across all major disasters, the same patterns emerge:

• Power dependency is the #1 failure mode — generators need fuel; batteries have limited runtime
• Centralized systems fail catastrophically — single points of failure amplify disasters
• Amateur radio consistently performs — proven across decades of disasters worldwide
• Mesh networks show promise — newer technology, increasingly deployed in disasters
• Training matters as much as equipment — unused equipment fails when needed most