Dear Colleagues,

Underground robotics and sensing have become increasingly popular in recent years as initiatives such as the DARPA subterranean challenge have shown. A wide variety of applications have been proposed, and several groups are presently working on these topics for the positive impact these have on society, such as sewer maintenance, search and rescue in case of disasters or accidents, or monitoring.

However, these environments have some particularities, such as being GPS-denied or having irregular, poor, or absent illumination, in addition to those related to communication that represent a real challenge due to the propagation patterns that largely differ from those in open space.

This Special Issue aims to present the latest research in this area, covering novel aerial and ground robotics field applications, theoretical analysis, communication architectures and protocols, hardware platforms, and wireless sensor networks frameworks for underground sensing.

Prof. Dr. Fernando Caballero Benítez
Prof. Dr. Kostas Alexis
Prof. Dr. Danilo Tardioli
Guest Editors

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• Localization
• Navigation
• Planning
• multi-robots
• UAV
• UGV
• exploration
• search and rescue