In 1942, a U.S. Navy airship flew out over the Pacific to search for Japanese submarines. It lost radio contact and, hours later, slowly crashed in the San Franciscan suburbs. Inside the gondola, everything seemed to be in order -- the parachutes were there, the instrumentation was functioning... but two-person crew was missing. To this day, no one knows exactly what happened aboard the L-8 Ghost Blimp.

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