Yi Lou received the B.Sc. degree in communication engineering from Jilin University, Jilin, China in 2009, and the M.Sc. and Ph.D. degrees in information and communication engineering from Harbin Institute of Technology, Harbin, China, in 2013 and 2017, respectively. He was a Visiting Student with the University of British Columbia, Kelowna, BC, Canada, in 2016. He is currently an Associate Professor with the College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, China. His research interests include energy harvesting wireless communications, underwater communications, cooperative communications, and cognitive radio networks. Niaz Ahmed received his B.S. degree in telecommunication engineering from NUCES-FAST University, Islamabad, Pakistan, the M.S. degree in computer engineering from CASE University, Islamabad, Pakistan, in 2010 and 2012, respectively, and the Ph.D. degree in electrical engineering from Missouri University of Scienceand Technology, Rolla, MO, USA, in 2017. He is one of the pioneers in the field of Magneto Inductive communication for underwater wireless sensor networks. He has published articles in reputed and prestigious journals and international conferences. He is also being selected in the OES student poster competition for two consecutive times. He is currently an Associate Professor in Harbin Engineering University University, Harbin, China. His research interests include wireless communication, underwater wireless sensor network, magneto-inductive communication and embedded systems.

• Introduction.- Part I Underwater Acoustic Communication and Networks.- Basic principles of UWAC.- Modulation techniques in UWAC systems.- Signal processing techniques in UWAC systems.- UWA network technology.- UWAC Technology Limitations and Research Trends.- Part II Underwater Optical Wireless Communication and Networks.- Composition of the UWOC System.- Underwater Wireless Optical Channel model.- Pointing Acquisitioning and Tracking (PAT).- Performance of UWOCS.- System performance enhancement techniques.- Underwater Wireless Optical Network technology.- Research Trends in Underwater Wireless Optical Communication Technology.- Part III Underwater MI Communication and Networks.- Fundamental Principles of MI Communication.- Analog and Digital Communication.- Power Dissipation.- Challenges and Limitations.- Relaying Networks and MI waveguides.- Advancements and Applications.- Conclusion.