Good luck finding anything with that. Bluefin-21 is craned over
the side of Australian Defence Vessel Ocean Shield in the search for
missing Malaysia Airlines flight MH 370 on April 14, 2014.
Handout—Getty Images
We can see countless millions of miles into the blackness of
space, but a 3-mile depth in the ocean is testing the very limits of our
technology because most of it just doesn’t work underwater
Men have played golf on the moon. Images transmitted from the surface of Mars have become utterly commonplace. The Hubble Space
Telescope can see 10 billion to 15 billion light-years into the
universe.
But a mere three miles under the sea? That’s a true twilight zone.
As the hunt for Malaysia Airlines Flight 370 demonstrates, at that
depth — minuscule compared with the vastness of space — everything is a
virtual unknown. A high-tech unmanned underwater submarine, Bluefin-21,
has been dispatched four times to look for wreckage from the jet, but
the crushing water pressure and impenetrability of this void mean that
only its most recent pair of missions were completed. Scrutinizing dust
and rock particles on the Red Planet, tens of millions of miles away, is
a breeze. Understanding what’s on the seafloor of our own planet is
not.
About 95% of deep ocean floor remains unmapped, but that’s almost
certainly where the most sought after aircraft in history is going to be
found. “Our knowledge of the detailed ocean floor is very, very
sparse,” Erik van Sebille, an oceanographer at the University of New
South Wales in Sydney, tells TIME.
The reason for our ignorance is simple. Virtually all modern
communications technology — be it light, radio, X-rays, wi-fi — is a
form of electromagnetic radiation, which seawater just loves to suck up.
“The only thing that does travel [underwater] is sound,” says van
Sebille, “and that’s why we have to use sonar.”
Sound is formed by mechanical waves and so can penetrate denser
mediums like liquids: but at a 3-mile (5 km) depth, even sonar starts to
have problems establishing basic parameters. The waters in which the
search for MH 370 is happening, for example, were thought to be between
13,800 and 14,400 ft. (4,200 and 4,400 m) deep, because that’s what it
said on the charts that had been drawn up over time by passing ships
with sonar capabilities. It turns out those seas are at least 14,800 ft.
(4,500 m) deep. We only know that now because that’s the depth at which
Bluefin-21 will automatically resurface — as it did on its maiden foray
— when onboard sensors tell it that it’s way, way out of its operating
depth. The problems with Bluefin-21, van Sebille says, show us that
“even our best maps are really not good here.”
The other issue affecting visibility is the sheer volume of junk in
the ocean. About 5.25 trillion particles of plastic trash presently
billow around the planet, say
experts, weighing half a million tons. There are five huge garbage
patches in the world’s seas, where the swirling of currents makes the
mostly plastic debris accumulate. The largest of these is the Great
Pacific Garbage Patch, a gyre measuring an estimated 270,000 to 5.8
million sq. mi. (700,000 to 15 million sq km). This refuse gets ingested
by plankton, fish, birds and larger marine mammals, imperiling our
entire ecosystem.
Flotsam debris has already impeded the hunt for MH 370. Hundreds of
suspicious items spotted by satellite have sent aircraft and ships on
hugely costly detours to investigate what turned out to be trash. (On
Friday an air-and-surface search continued,
with 12 aircraft and 11 ships scouring an area of some 20,000 sq. mi.
[52,000 sq km] about 1,200 miles [2,000 km] northwest of Perth.)
Officials are saying that such efforts are becoming futile.
For all we know, Bluefin-21 could also be confused by the sheer volume of garbage down there. According to a study
by the Monterey Bay Aquarium Research Institute published last June,
based on 8,000 hours of underwater video, an unbelievable quantity of
waste is strewn across the ocean floor. A third of the debris is thought
to be plastic — bags, bottles, pellets, crates — but there is a vast
amount of metal trash as well, including many of the 10,000 shipping
containers estimated
to be lost each year. “I was surprised that we saw so much trash in
deeper water,” said Kyra Schlining, lead author on the study. “We don’t
usually think of our daily activities as affecting life two miles deep
in the ocean.”
That’s because we can’t see it. It’s tempting to say that MH 370
might as well have vanished into space — only if it had, we’d have found
it by now.
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