The most energetic neutrino ever detected was observed by the KM3NeT detector on the sea floor. This particle, likely from a distant galaxy, was discovered in 2023 and revealed in 2024 by researchers. The team had to ensure the detection was accurate, leading to the recent publication of their findings in Nature. Neutrinos, typically produced in nuclear reactions, have been recorded with energies up to several quadrillion electronvolts, originating from distant galaxies. The KM3NeT detector, anchored in the Mediterranean Sea, picks up high-energy particles like muons, providing important insights into cosmic phenomena.
https://www.nature.com/articles/d41586-025-00444-1