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Thiyagarajan Ranganathan is a robotics researcher specializing in the design, modelling, and control of autonomous underwater vehicles (AUVs), aerial-underwater hybrid robots, and multi-medium unmanned systems. His work sits at the intersection of hydrodynamics, mathematical modelling, and robotic systems engineering, with a particular focus on expanding the operational boundaries of autonomous vehicles across fluid domains. Ranganathan's most influential contribution is the AQUAD, a novel underwater quadrotor configuration inspired by aerial drone architecture, which has garnered 18 citations since its 2015 publication and demonstrated new possibilities for compact, thruster-based underwater mobility. He further advanced the field with RoBuoy, an innovative underwater glider that departs from conventional variable-buoyancy mechanisms, and with the Acutus platform — a hybrid aerial-underwater robot capable of transitioning between air and water — explored across multiple studies totalling over 17 citations. His 2022 work on submersible multi-medium UAVs reflects a growing commitment to cross-domain adaptability and energy-efficient autonomous navigation. With a cumulative citation count exceeding 50 across his key publications, Ranganathan's research offers foundational contributions to next-generation amphibious robotics, making his work essential reading for engineers and researchers working on multi-domain autonomous systems.