We present a multi-wavelength study of the emission-line nebulae located ~38 (3 kpc in projection) southeast of the nucleus of M87, the central dominant galaxy of the Virgo Cluster. We report the detection of far-infrared (FIR) CII line emission at 158 mu m from the nebulae using observations made with the Herschel Photodetector Array Camera and Spectrometer (PACS). The FIR through ultraviolet line emission is most likely primarily powered by the ICM particles penetrating the cold gas following a shearing induced mixing process. An additional source of energy may, in principle, be provided by X-ray photo-ionization from cooling X-ray emitting plasma. The relatively small line ratio of OI/CII < 7.2 indicates a large optical depth in the FIR lines. The large optical depth in the FIR lines and the intrinsic absorption inferred from the X-ray and optical data imply significant reservoirs of cold atomic and molecular gas distributed in filaments with small volume filling fraction, but large area covering factor.