Scientists Claim They’ve Found “Exotic Water” Deep Inside Earth

It sounds almost like science fiction to think that water could be hundreds of miles below our feet. However, scientists who are researching Earth’s deep interior are beginning to believe that something strange—what they frequently refer to as “exotic water”—is concealed there.

This is not an underground ocean in the sense that people think of liquid-filled caves. The truth is more bizarre. Water appears to exist deep within the Earth’s mantle in forms that don’t resemble the liquid in a glass or the ice in a freezer. And that insight is subtly changing the way scientists view the earth.

The story started with an unexpected clue years ago. In 2014, traces of a rare mineral known as Ringwoodite were found by scientists studying a diamond extracted from deep within the Earth. The discovery was noteworthy because of what was trapped within the mineral, not the mineral itself, as geophysicists had already predicted.

The mineral’s crystal structure contains hydrogen and oxygen, but not exactly liquid water. The finding raised the possibility that massive amounts of water could be trapped deep within the Earth’s mantle, compressed by pressure so great that it alters the behavior of water at the atomic level.

Consider the situation about 400 miles below the surface. more than 1,000 degrees Celsius in temperature. Tens of thousands of times as much pressure as we encounter at sea level. Water doesn’t just boil away in those conditions.

Diamond-anvil presses, which are devices that squeeze small samples between two gem-hard surfaces, have been used by researchers to replicate similar pressures in lab settings. Superionic Ice is one of the unusual states that water can form inside those chambers.

Just the name makes it sound more like something from a physics textbook than a geology lab.

In this peculiar state, hydrogen ions flow freely through a solid crystal lattice made of oxygen atoms, resembling an electrical fluid. It is sound technically. However, not exactly as most solids do.

There is frequently a feeling of silent awe as scientists explain these experiments. Under harsh circumstances, water—possibly the most familiar material on Earth—continues to reveal new personalities.

How much of it might be concealed underground is especially fascinating.

According to some estimates, there may be as much water in the mantle transition zone—a layer that is between 410 and 660 kilometers deep—as there is in all of the Earth’s surface oceans put together. Water that has been chemically trapped inside minerals, rather than flowing oceans, of course.

A more significant question about Earth itself is brought up by that possibility.

The planet’s water cycle has been characterized as a surface process in textbooks for many years. Clouds form, rivers flow, rain falls, and oceans evaporate. That picture is complicated by the concept of a deep planetary water reservoir.

It implies that the water cycle might reach much farther into the interior of the Earth than previously thought.

A curious observation has also been made by researchers who study seismic waves, which are vibrations caused by earthquakes. Waves travel through rock at a slightly slower speed in some areas of the mantle transition zone. Water-bearing minerals are frequently indicated by that behavior.

The evidence isn’t entirely clear, though. The clear certainty of laboratory chemistry is rarely found in geology. Indirect signals, such as waves passing through rock, pieces carried upward by volcanic eruptions, or minerals trapped in diamonds, must be interpreted by scientists.

There is always some degree of uncertainty. However, many geophysicists believe that a sizable reservoir of chemically bound water exists in the deep mantle, subtly affecting the planet’s geology.

Plate tectonics and volcanic activity may even be influenced by that water. Water alters the melting temperature of rocks as it enters the mantle through subducting oceanic plates, which may contribute to the formation of magma.

The surface of the Earth might appear very different in the absence of this deep reservoir. It’s difficult to avoid feeling as though your perspective is changing as you watch this research develop. The Earth’s interior is typically thought of as layers of dry, molten rock beneath the crust.

However, the truth might be much more nuanced. There may be a secret water system on the planet that extends hundreds of miles beneath the surface and that scientists are just now starting to comprehend.

The story also has a cosmic component. It is believed that distant planets and moons also contain the unusual types of water that are investigated in high-pressure laboratories. Deep within the interiors of ice giants like Neptune and Uranus are probably layers of superionic water.

Thus, Earth’s concealed water could provide a tiny window into other worlds’ physics. The precise amount of water that is buried beneath our feet and how it travels through the Earth’s mantle over millions of years are still unknown. The models continue to change as the research continues.

But it’s hard to overlook the wider implication. It appears that water may not be as restricted to the Earth’s surface as previously believed. Furthermore, the story gets stranger and more intriguing the more scientists investigate the planet.