Researchers are deploying cutting-edge underwater telescopes in the Mediterranean Sea to study elusive particles from space. The ambitious project, known as the Cubic Kilometre Neutrino Telescope (KM3NeT), involves the installation of hundreds of glass spheres on vertical cables deep below the ocean’s surface.
These detectors aim to capture fleeting signals from neutrinos, mysterious particles that could unlock secrets to the universe’s most vigorous events. The sub-aquatic observatories would hopefully uncover the origins of the particles, which possess immense amounts of energy but are nearly impossible to detect.
Unlike traditional telescopes that capture light, these devices focus on spotting faint flashes caused by neutrinos in their interactions with seawater. Researchers say the endeavor could open a new chapter in the understanding of the universe.
“It’s weird if you think about that,” said physicist Simone Biagi of the National Institute for Nuclear Physics in Italy. “We want to do astronomy, and to look at the universe we place a telescope underwater.”
An underwater forest in the deep sea
So far, 57 cables have been installed, with plans to add hundreds more. The detectors are placed several miles beneath the surface of the water off Sicily and the southern coast of France. Once complete, the setup will resemble an underwater forest, swaying silently in the deep sea’s darkness.
The two telescopes serve distinct purposes. The Sicilian telescope array, ARCA (Astroparticle Research with Cosmics in the Abyss) looks for high-energy neutrinos from outer space, while the French telescope array, ORCA (Oscillation Research with Cosmics in the Abyss) studies atmospheric neutrinos to determine how they transform into various types.
This approach mirrors that of the IceCube observatory in Antarctica, which detects neutrinos in ice rather than water.
Precision deployment under pressure
Deployment campaigns take place annually and require meticulous planning. A crane aboard a ship lowers each coiled cable to the seabed. A remotely operated submersible then descends to connect and inspect the equipment.
Once a strand is ready, the submersible triggers its deployment. A buoy helps lift the cable as glass spheres are released, floating upward like an opening fern frond. Onshore teams immediately assess the performance of each newly installed cable. Any issue must be addressed quickly, as adjustments underwater are impossible.
Unlocking cosmic mysteries
Despite the challenges, researchers are already utilizing partially built telescopes for experiments. They are studying neutrino oscillations—how neutrinos change type—and exploring how quantum gravity might influence the particles.
The work is demanding, with scientists battling seasickness, irregular sleep, and costly ship operations, which can run up to one dollar per second.
Yet, Biagi noted, there are advantages to the underwater telescopes in the Mediterranean. As the project advances, researchers hope KM3NeT will shed light on some of the universe’s greatest mysteries, proving that even the darkest depths of the ocean can help us see the stars.
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