On Tuesday morning in Uttarkashi, Uttarakhand, officials established audio-visual communication with the 41 trapped workers through a 6-inch pipeline, marking a significant advance in the rescue operation of the Uttarkashi tunnel collapse, stated a report in news agency ANI. 

According to the report, with the use of an endoscopic flexi camera put into the pipeline, rescue personnel were able to establish a clear line of communication with the confined workers. Workers congregated close to the camera so that the rescue team could identify them and get in touch with them. In order to ensure that food would be available when the process was finished, the teams instructed the workers to wipe the camera screen before cleaning the pipeline and compressor.