Folium Sensing is a deep-tech startup that transforms ordinary optical fiber cables into intelligent, distributed sensors for real-time monitoring of critical infrastructure. Utilizing advanced Distributed Acoustic, Temperature, and Strain Sensing (DAS, DTS, DSS), their platform enables continuous monitoring of tunnels, pipelines, railways, power plants, HVAC systems, and defense assets over tens of kilometers using a single device. By leveraging existing fiber infrastructure, Folium delivers scalable, cost-effective, and highly reliable infrastructure monitoring for industrial, urban, and national security applications.