POWER
OF THE DEEP |
Beneath
the waters of the area of ocean known as the Bermuda Triangle is an
ancient immensely powerful source of energy. But before anyone thinks
science fiction has suffered a bad attack of new age nonsense, lets get
things straight. The energy source is methane gas, and there are no
alien spaceships or suburbs of Atlantis here. The
myth of the Bermuda Triangle as the site of mysterious disappearances
and strange events has generated millions of profitable words for the
Aliens-Ate-my-Hamster school of writers, not at least Charles Berlitz
whose book on the subject has sold nearly 20 million copies in 30
different languages since 1974. Of course, ships can disappear suddenly,
oceans can boil and instruments go haywire. But scientists now have an
explanation for these phenomena, and the cause is chemical rather than
extraterrestrial. It goes by the name methane gas hydrate, and though it
doesn’t have quite the same ring as Atlantis, it is strange stuff. All
gases except hydrogen, helium and neon are now known to be able to form
compounds called as hydrates in association with water if enough gas and
water are present, the temperature is cold enough, the pressure is high
enough. Joseph priestly, the British discoverer of oxygen, is believed
to have produced oxygen hydrate sometime in 1780s, while chlorine
hydrate was produced by Sir Humphrey Davy in 1810. It was the discovery
by Soviet workers of a strange “fizzing ice” blocking up their
natural gas pipes un 1928- and its identification six years later by the
American chemist E G Hammerschmidt as a hydrate of methane – that
began the trail leading towards the Bermuda Triangle. Methane
Hydrate is methane that has been entombed inside an icy crystalline cage
of water molecules, a chemical jail into which large amounts of gas have
been squeezed by high pressure and cold. In case of Methane one litre of
the hydrate that had formed in the chilly gas pipes of Kazakhstan in the
1920s amounted to 167 litres of spongy gas and a puddle of water when it
made its energetic expansion to normal atmospheric pressure after
removal from the icy ground. One place where temperature and pressure
conditions are right for methane hydrate to form is permafrost. Another,
reasoned the experts, should be the seafloor sediments in water several
hundred metres deep, where the pressure and temperatures are also right
for methane- created by decomposing organic debris – to wind up locked
into the jailhouse of methane hydrate. Experts
found what they were after in the early 1970s when the fizzing ice that
had caused consternation in Kazakhstan turned up again in test cores
drilled through the ocean floor in (spooky this) the Bermuda triangle.
Around the same time, oceanographers realized that strange sonar
readings of the seabed floor, which seemed to show a phantom seafloor
several hundred metres beneath the real one, were also an indication of
gas hydrate layers. Global
surveys have now found these signals (Called the “Bottom simulating
reflector” or BSR) along continental slopes all over the world, a fact
explaining less well-publicized tales of Bermuda Triangle style
weirdness from places as far apart as the Caspian Sea and Japan. What
the geographical spread of seafloor hydrate also represents is a huge
storehouse of methane gas waiting to be freed from its prison cell and
put to use. But,
as with any jailbreak, there are risks involved. With methane hydrate,
an uncontrolled release is asking for trouble. In fact, gas-industry
experts were already familiar with the dramatic effects of methane gas
blowouts when ocean drilling went wrong, but it was not until 1981 that
geochemist Richard McIver went public on a link with the Bermuda
Triangle myth. There
are many dangers in a methane gas blowout. One is its effect on water
itself. To a ship at sea, water is a changeable medium, where buoyancy
depends on things like salinity and temperature. For example, warm
freshwater is less dense than cold saltwater, so a ship would float
lower sailing up a warm river than on the Atlantic. So
Imagine what would happen if an ocean floor methane gas pocket was
ruptured. A vast reservoir of gas would suddenly surge form the seabed,
rising up in a giant plume through the ocean before erupting on the
surface without warning. A
ship caught in such a blowout would be doomed. The water beneath it
would suddenly become much dense due to the gas, sinking it in a matter
of moments – the fate of over 40 rigs lost to gasified water
worldwide. The vessel would plunge into the depths, where it would
plunge into the depths, where it would be covered up as sediment
disturbed by the blowout settled back on the seabed. Another
supernatural disappearance or just another natural disaster? Planes,
too, could fall prey to the deadly blowout. A plume of methane gas would
continue to rise once it had reached the ocean surface since methane is
lighter than air, and any aircraft flying into this invisible zone of
danger would face two hazards. If the methane were very concentrated,
its engines would fail due to lack of oxygen. A more likely disaster,
however, would result if the plume mixture was between 5 to 15 percent
methane. Such a mixture is explosive and not the place you want to be
with hot engine exhausts. McIver’s
theory depends on there being something to cause the gas blowouts, since
the Bermuda Triangle isn’t yet an area of heavy gas drilling. Nature,
however, offers a solution in the form of underwater landslides, and
McIver’s proof came from an unexpected source when he discovered that
telephone companies had long suffered cable breakages all along the
North American continental shelf. Sonar surveys have now shown the vast
majority of breakages occur at the site of seafloor landslides. Such
slumps can be massive – one was 40 miles wide – and would easily
rupture gas hydrate layers beneath the seafloor, freeing the gas trapped
beneath the hydrate “cap” as well as liberating massive amounts of
methane trapped within the hydrate itself, which would break open as the
pressure changed. But
a substance that is bad news for any ship or plane passing at the wrong
moment also offers an amazing solution to the energy demands of the next
century. Hydrates store immense amounts of methane; not counting the
methane natural gas that exists in conventional form beneath the hydrate
layers themselves. Remember, one helping of methane in its pressurized
hydrate form is equivalent to 167 helpings of free methane. The US
Geological Survey has estimated that just two relatively small areas of
the North and South Carolina coast (part of the Bermuda Triangle)
contain over 70 times the annual gas consumption of the US, while
putting 16 noughts after a two gives you an idea of the current global
estimate for cubic metres of methane gas locked in hydrates. “The
present oil-based economy may well be replaced by a natural gas-based
one as early as the first or second decade of the next century”, says
Peter Miles of the Southampton Oceanography Center. “Just one percent
of the most conservative estimate of gas hydrates is equivalent the half
the current proven natural gas reserves.” Methane
gas, says Miles, is the last remaining hydrocarbons waiting to be
exploited, and leading industrial nations are already setting up both
ocean and permafrost drilling projects to do so. The news may not be all
good, though. The fact that methane hydrates are only stable under
narrow temperature and pressure conditions makes them especially
vulnerable to climate change. Some experts believe that global warming
– which is expected to be most pronounced in Polar Regions – could
trigger the catastrophic decay of shallow gas hydrates within the
permafrost. Since methane is green house gas, this leads to more global
warming, causing more hydrate decay, and the start of a nasty climatic
cycle. Its
volatility means the number of people who have actually seen the methane
gas hydrate in its fizzing state is tiny. Yet its presence is likely to
loom over the early decades of the next century, a powerful force that
may give us energy to burn or burn us up instead. (Norman
Miller The Sunday Times, London) |
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