1. https://newatlas.com/hibot-thesbot-pipe-inspecting-robot/40726/
2. https://en.wikipedia.org/wiki/Sewer_gas
3. https://en.wikipedia.org/wiki/Chennai
. Last accessed on 12.03.2019
4. Somashekhar D, Hiremath S, Singaperumal M, Ramakrishnan R (2013) Design and development of a reconfigurable type autonomous sewage cleaning mobile manipulator. Procedia Eng 64:1464–1473
5. Mateos LA, Vincze M (2013) In-pipe robot with capability of self stabilization and accurate pipe surface cleaning. Automation and Control Institute (ACIN), Vienna University of Technology (TU WIEN), Vienna