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Soft in-pipe navigation robot is a special class of in-pipe robot, where the structure is made entirely of soft materials. The soft in-pipe robots are cheaper, lightweight, robust, and more adaptable to the environment inside pipelines as compared to the traditional rigid in-pipe navigation robot. This paper reviews the design of different types of soft in-pipe navigation in terms of the material, structure, locomotion strategy, and actuation techniques. These four different aspects of the design help researchers to narrow down their research and explore different opportunities within each of the design aspects. This paper also offers suggestions on the direction of research to improve the current soft in-pipe navigation robot design.<\/jats:p>","DOI":"10.1017\/s0263574724001796","type":"journal-article","created":{"date-parts":[[2024,11,26]],"date-time":"2024-11-26T08:06:20Z","timestamp":1732608380000},"page":"387-413","source":"Crossref","is-referenced-by-count":4,"title":["A review on soft in-pipe navigation robot from the perspective of material, structure, locomotion strategy, and actuation technique"],"prefix":"10.1017","volume":"43","author":[{"given":"Glady Amen","family":"Anak Victor Luna","sequence":"first","affiliation":[]},{"given":"Mohd Shahrimie","family":"Mohd Asaari","sequence":"additional","affiliation":[]},{"given":"Mohamad Tarmizi","family":"Abu Seman","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4890-3415","authenticated-orcid":false,"given":"Abdul Sattar","family":"Din","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2024,11,26]]},"reference":[{"key":"S0263574724001796_ref24","doi-asserted-by":"crossref","unstructured":"[24] Yamamoto, T. , Konyo, M. and Tadokoro, S. , \u201cA High-Speed Locomotion Mechanism using Pneumatic Hollow-Shaft Actuators for in-Pipe Robots,\u201d In: 2015 IEEE\/RSJ International Conference on Intelligent Robots and Systems (IROS), (2015) pp. 4724\u20134730.","DOI":"10.1109\/IROS.2015.7354050"},{"key":"S0263574724001796_ref26","doi-asserted-by":"publisher","DOI":"10.1089\/soro.2016.0078"},{"key":"S0263574724001796_ref47","doi-asserted-by":"crossref","unstructured":"[47] Das, R. , Babu, S. 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