After the harrowing 17-day watch for confirmation that the Boeing 777 crashed into the southern ocean, searchers square measure athletics to find the alleged black boxes before a powered ping they emit fades away.

By law, the boxes with should be ready to send those signals for a minimum of thirty days following a crash. however specialists say they\'ll continue creating noise for an additional fifteen days some on the far side that, relying upon the strength of the recording machine battery at the time of the crash.

Without the black boxes — the common name for the voice and information recorders unremarkably connected to a body — it might be nearly not possible for investigators to definitively say what caused the crash.

Now that some rubbish has probably been found, here´s what comes next:

NEEDLE during a hayrick

The location of the plane remains unknown quite period once it crashed, though Malaysian authorities say a British satellite company has pinpointed its last position within the ocean, wherever many countries have reported  finding floating rubbish.

It´s currently up to specialists in ocean currents and weather patterns to present searchers their best estimate on wherever the plane truly went down, that is wherever the black boxes — they´re very red cylinders — square measure possible to be settled.

\"We´ve have to be compelled to get lucky,\" aforementioned John Goglia, a former member of the US National Transportation Safety Board. \"It´s a race to urge to the world in time to catch the recording machine pulse generator whereas it´s still operating.\"

To \"catch\" the signal, searchers are swing to use a sophisticated listening device loaned by the U.S. Navy.

TOWED pulse generator LOCATOR:

One of the Navy´s Towed pulse generator Locators is already on the way to the search space.

It´s a 30-inch-long cylindrical electro-acoustic transducer that´s slowly towed underwater during a grid pattern behind an ad ship. it\'ll obtain any recording machine ping emitted from, on average, one mile away — however might hear a ping from a pair of miles away relying upon variety of things, from ocean conditions to topography to if the black boxes square measure buried or not.

The listening device is connected to concerning twenty,000 feet of cable and is guided  through the ocean depths by a yellow, triangular carrier with a shark fin on high. it\'s sort of a ray and incorporates a distance of three feet.

The device sends information up that long cable each 0.5 second, wherever each human operators and computers aboard a ship rigorously listen for any robust signals and record a ping´s location. The ship keeps towing the device over the grid so operators will triangulate the strongest pings — and hopefully find the precise location of the black boxes.

Aside from the Towed pulse generator surveyor, associate Australian navy support vessel, the Ocean protect, is anticipated to arrive within the search zone among 3 or four days, officers aforementioned.

It´s equipped with acoustic detection instrumentation that may conjointly listen for pings.

IF THE PINGS AREN´T HEARD:

If no robust signals square measure settled before the battery on the black boxes fades away, then searchers should march on to victimization side-scan asdic via devices that send sounds to the sea´s depths and analyze the echo come to map the bottom. that enables specialists to appear for any abnormalities within the ocean floor or any form that wouldn´t unremarkably be related to the world.

The asdic devices may be towed behind a ship or used with pilotless mini submarines which will dive to the bottom for concerning twenty hours at a time, scanning the search space, mapping the ocean and looking out for the portion.

This is however searchers found the portion of Air France Flight 447, that went down in 2009 within the Atlantic between Brazil´s northeast coast and western continent. Underwater oceanrch vehicles scanned the mountainous sea floor and sent information copy to specialists aboard ships that stayed confused for a month at a time.

Finally, proof of doable rubbish was detected by asdic. Another underwater vehicle with a special high-resolution video camera was sent in to permit scientists to visually examine the world.

In the case of the Air France jet, it took quite $40 million, four extended searches and nearly 2 years before the plane and also the black boxes were found. (AP