The KM3NeT neutrino telescope, still under construction, detected the highest-energy neutrino ever recorded before completion.Neutrinos are challenging to detect due to their elusive nature and only interact through gravity and the weak nuclear force.Neutrinos are often referred to as 'ghost particles' as they have no electric charge and minimal interactions with matter.A recent observation by KM3NeT in the Mediterranean Sea marked a milestone in detecting cosmic neutrinos.The detected neutrino was associated with a muon with an energy level of 120 (+110/-60) petaelectronvolts.High-energy neutrinos like these may originate from distant cosmic sources, providing insights into astrophysical phenomena.The detection indicates the possibility of observing cosmogenic neutrinos resulting from interactions of ultra-high-energy cosmic rays.The KM3NeT Collaboration aims to enhance detector positioning to improve source direction accuracy for future detections.Potential sources for the detected neutrino include active galactic nuclei like blazars, as suggested by researchers.Neutrinos are valuable in understanding the Universe, with this detection offering significant insights into neutrino astrophysics.