Journey To the Mantle of the Earth By 2020

An anonymous reader writes "A half-century after the first attempt to drill through the ocean crust into the Earth's mantle, a new campaign armed with improved technology is underway that could reach the mantle by the end of the decade, researchers say."

Comments

Looking back now, it was a terrible mistake

[elrous0]

But how could we have known that's where those alien microbes were? God help us, HOW COULD WE HAVE KNOWN!?

Re:Looking back now, it was a terrible mistake

[ElectricTurtle]

As much as people love to get worked up about doomsday science, I think the only real credible threats are grey goo and malevolent strong AI, and both of those things are probably at least another generation or two away.

There is too much genetic diversity and geographic separation of human populations for a virus to wipe them all out. Even in the middle of some of the worst of plagues some people were immune. The energy involved in achieving any kind of planetary effects is for all intents and purposes currently impossible to produce, and if H bombs didn't ignite the atmosphere, what, if anything, could?

Re:Looking back now, it was a terrible mistake

[mark-t]

What would tend to happen is that as they drill the hole, lava starts climbing up the shaft and cooling again into solid rock. Even once they are all the way through, the lava will still quickly cool into rock as it comes onto the surface.

Ultimately, it would amount to becoming a man-made volcano... one that would probably take several centuries before it was of any significant size, and that's assuming that it remains active for that amount of time.

Re:Looking back now, it was a terrible mistake

[rgbatduke]

There is actually a very simple argument from thermodynamics and/or statistical mechanics that this will not happen. No matter what you think that we might do -- drill down to the Earth's mantle, for example, or build a super-accelerator capable of extremely energetic collisions -- Nature does it first, and does it all of the time. For example, asteroids have drilled down to the Earth's mantle in the past, and volcanoes do it in the present. Galactic Cosmic Rays with energies greater than anything we can imagine creating in an accelerator happen all of the time -- the most powerful one observed so far is (IIRC) a proton with roughly the same kinetic energy as a baseball travelling at 90 mph. People worried that the first nuclear bomb would ignite the atmosphere and turn the world into a short-lived sun, ignoring the fact that temperatures and pressures well in excess of nuclear bomb temperatures occur in both the GCR events and in asteroid impacts -- if such a thing were possible, it would have already happened long ago.

So you are actually probably pretty safe from most things like this that we might do. Even a global thermonuclear war (which is no longer terribly likely, at least at this time, politically) is very unlikely to kill off all of humanity. Nature, however, could easily produce a pandemic killer bug without our help. Or a nearby sun (including our own) could almost casually snuff out the human race in a matter of minutes. Or a really big rock could fall and manage it. There are a few "plausible" extinction/doomsday scenarios, if by plausible you mean things that could cause it are known to happen somewhere in the Universe and could do the job, but none of them are terribly likely on a timescale of a few million years at this point in the natural evolution of our solar system and our biosphere. They are, if anything, less likely as time goes by -- a pandemic that might have been (nearly) universally fatal three hundred years ago would probably not be today, between our knowledge of the causes of disease and our ability to produce remedies and or quarantines that would very likely contain it.

In a nutshell, we probably won't "destroy ourselves", but if we really want the human species to survive in the long run, we do need to move off of planet Earth and out into the Universe at large -- events likely to wipe out all life on Earth are rather likely to be confined to Earth or local Galactic environments until we hit deadlines like the Big Crunch or the Big Freeze. By which time, singularity or not, we'll both likely be dead...

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Re:Looking back now, it was a terrible mistake

[jc42]

In all seriousness, that would be a pretty significant discovery if we found life living close to the mantle.

Actually, few biologists would be surprised. One of the more interesting things about previous deep-drilling projects is that they've turned up micro-organisms all the way down. Projecting the microbe count from these holes has produced the estimate that there is more biomass inside the planet than on its surface and in the oceans. Of course, this is based on a very small sample, so nobody takes it too seriously.

But still, the fact that we've found living things everywhere we've drilled means that the default assumption should be that we'll keep finding them. Presumably it'll get too hot for life at some depth, but so far we have no clue at all what this depth might be. The really significant thing would be if we found no decrease in the density of microbes at any depth.

And I don't think the critters down there qualify as "alien". From the few samples that've been studied, they are very similar to the things living inside rocks near the surface. We might have to go to other planets to find something truly alien. And maybe the things living inside the other planets will turn out to be relatives of the things living here.

For further information, ask google about "deep-rock microorganisms" (without the quotes). There's quite a bit of information on the subject online.

Journey to the Center of the Earth!

[TaoPhoenix]

Jules Verne Likes This.

I predict...

[Stenchwarrior]

...they'll find a bunch of lonley socks. I mean, those fuckers have to end up somewhere.

Heat issues

[Scootin159]

The soviets have already tried this, but ran into issues with the deep-crust temperatures (570*F when they stopped, but it was still climbing) melting their drill bits. How is this project intending to resolve this issue?

Re:Heat issues

[sootman]

They'll go at night! Wait, sorry, wrong joke.

Old News

[bedouin]

Shredder and Krang already did this in like 1989.

Re:Nuclear waste disposal

[KarrdeSW]

You want to put spent nuclear fuel rods into a burning hot ocean of magma in a spot where enormous upward pressure is being exerted? Realistically, a hole in the earth's crust that reaches the mantle already has a name. It's called a volcano. You wouldn't try to shit in an overflowing toilet, would you?

Though you may have something if you meant that we somehow insert spent fuel into a Subduction Zone, where a portion of the crust is sinking into the mantle anyway.

Personally, I'm all for storing the old fuel until technology becomes sufficiently advanced to use it again, there is still a ton of energy present in it. I'd say the best way to be safe from the stuff it is to bleed it dry.

Re:Nuclear waste disposal

[0100010001010011]

They're called breeder reactors and already exist. They just happen to be illegal in the united states.