In January this year India suffered what was probably the most destructive earthquake in its history. Official statistics suggest 20,000 died, although observers claim it could have been twice as many. Geologist Roger Bilham fears this could be a foretaste of a far more catastrophic event. His studies of the Himalayas suggest that northern India is overdue seven massive earthquakes, each one dwarfing the most recent. Disaster expert Bill McGuire joins Bilham in India as he probes the destructive forces that lurk within the subcontinent.
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