A study published in *Science Adviser* reveals that fibre optic internet cables, essential for high-speed communication, can inadvertently function as listening devices by detecting vibrations from nearby sounds, including conversations. Researchers utilized a method known as Distributed Acoustic Sensing (DAS), which involves sending laser pulses through the cables and analyzing how light signals change in response to sound. While this technology has beneficial applications, such as monitoring traffic and detecting earthquakes, it poses potential surveillance risks if misused. Experts emphasize that while recovering clear conversations is challenging and requires expensive equipment, the possibility of eavesdropping raises significant privacy concerns. Cybersecurity professionals are advocating for enhanced protections, including better cable insulation and stricter monitoring of network access, to safeguard against potential misuse. As fibre broadband networks expand globally, the implications of this technology on privacy and cybersecurity continue to spark debate.