Still unsolved, still baffling, still claiming new victims. Here are the untold stories.

A pilot reports a strange haze enveloping his plane, then disappears; eleven hours after fuel starvation, as if calling from a void, he is heard 600 miles away. He requests permission to land, then vanishes forever. A freighter steaming over placid seas disappears without a trace. A pleasure yacht ghosts past without a soul on board. A pilot calls for help because a "weird object" is harassing his plane. A jet collides with an "unknown" and is never found. . . .