Up to now, people already discovered on boundless and indistinct sea tens of unmanned boat, alone, bizarre and mysterious, seem to telling story of one stake stake, however have no way speaks of.
On Feburary 28, 1855, british barque horse pulls a slight-pause mark used to set off items in a series to encounter apprentice of unmanned boat of an United States in Beijing University West • cuts Ruimusi date of Si Jie Er. This ship sail hangs down fall, do not have one person for nothing, and the ship is in good condition, goods remain as before, food fresh water is enough, also do not have any fighting to mix violent evidence, just do not see one person, also cannot find nautical diary and compass.
1880, people is in city of baud of button of American Luo Deai Lanzhou • compares Yisidusi the unmanned boat that also discovers one is called Xibaierde on the offing near strange town, the breakfast of captain's room still is in, and crew does not know whereaboutldirection however.
More mysterious should calculate by 1881, a thing that date place experiences Austin of • of Alan of gunboat of sail of American fast aircraft. This year on December 12, when make one's rounds of gunboat of fast aircraft sail swims, an unmanned caique discovers in Beijing University West. Outside nobody are being divided inside this boat, everything is normal, fruit, bottled wine, fresh water, food is intact. A few bluejacket take lot of the Fu Fen in case of captain of a naval ship on caique, pulling this boat voyage by his warship. When still having 3 days of leg from the coast, maritime fierce wind blows hard, pull marine cable to rupture, the night is boundless and indistinct, two boats lost connection, call is not had sound. The following day, when Alan • Austin date discovers this caique when, but the bluejacket that captain of a naval ship expedites disappeared! Have 300 kilometers only from new York right now, was about to arrive home soon. Captain of a naval ship of the Fu Fen in case buys that caique to go up with heavy gold again used a few people, this day of visibility is very good, gentle breeze blow gently. Before dawn, cox of Alan • Austin date discovers boat deviate course, when he sees the sailing boat that hauling again later, can't help astonied: Caique disappeared! such, of this caique was missing nautical history on another mysterious mystery.
To unmanned boat case, the scientist offerred a probable truth to people: Wave of marine infrasonic sound. Say exactly, of this kind of bizarre episode appear, it is to get likely the action of wave of marine infrasonic sound and cause.
Wave of marine infrasonic sound is mixed in storm commonly appear below blast, its frequency under 2O hertz. Spread the level that rupture with wave of ministry of wave surface wave crest, decide the energy of infrasonic sound wave. If be great storm, the power of infrasonic sound wave can amount to tens of kilowatt. And the energy of infrasonic sound wave belongs to weak attenuation energy, can pass very far consequently. When the infrasonic sound wave that encounters this kind of strong energy when seagoing vessel, object of opposite of infrasonic sound wave can create radiation appearance. The infrasonic sound wave of certain frequency, the exhaustion that can cause person and animal, painful, cause blindness even. In the meantime, too powerful infrasonic sound wave often makes person and animal generation frighten mood, bring about the personnel on the boat to jump to the sea commits suicide and be missing.
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