The international collaboration that operates the KM3NeT experiment, a powerful telescope submerged in the depths of the Mediterranean, today

The KM3NeT telescope comprises two detectors, ARCA and ORCA, utilizing seawater to capture Cherenkov light—a bluish glow produced when neutrinos interact with water molecules.

Europe is building a huge observatory for neutrinos in the Mediterranean. Although it is not yet finished, it has already set an energy record.

KM3NeT comprises two large neutrino detectors at the bottom of the Mediterranean. One called ARCA - 3,450 meters (2.1 miles) deep near Sicily - is designed to find high-energy neutrinos. One called ORCA - 2,450 meters (1.5 miles) deep near Provence, France - is designed to detect low-energy neutrinos.

Neutrinos are very mysterious particles,” says Damien Dornic, one of the co-authors of a new paper published February 12 in Nature that describes the detection of the decay products of an extremely high energy neutrino by the Kilometer Cubed Neutrino Telescope (KM3NeT),

An extraordinary event consistent with a neutrino with an estimated energy of about 220 PeV (220 x 1015 electron volts or 220 million billion electron volts), was detected on February 13, 2023, by the ARCA detector of the kilometer cubic neutrino telescope (KM3NeT) in the deep sea.

Although still under construction, the sea-floor KM3NeT detector spotted a neutrino 20 times more powerful than any previously detected.

NEW YORK (AP) — A neutrino detector submerged in the Mediterranean Sea has sniffed out the most energetic ghost particle yet, scientists reported Wednesday. The newly detected neutrino is around 30 times more active than the previous recordholder. Scientists think it came from outside the Milky Way galaxy but its exact source remains a mystery.