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safely. we dropped and were thrown up again. reporter: this photograph shows what happens when volcanic ash cakes. all of the grains of rock and sand and glass enter the engine, they begin to melt coating the turbines and clock clogging the enk ifrn. reporter: the engine shuts down. restarting the engine takes tremendous skill and a good deal of luck. from 1982 a 747 crew other the indian ocean at night never saw a massive volcanic ash cloud then suddenly faced a real emergency. all four engines stopped and we went down to 12,000 feet. reporter: forcing air through the engines eventually cleaned out the ash so they could restart. it can have a sand blasting ekt, clogging passenger ventilation systems and disrupting navigation. we learned a great deal about