How ROV works and information on how to build one

Hello OpenROV community, I am very new to the ROV technology but I found this community as I just began my search online. I need basic information like how ROV works and how to build one. I will appreciate every help that I get here. Thank you.

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https://www.amazon.com/Underwater-Robotics-Science-Design-Fabrication/dp/0984173706

The best starter info

Thank you! That is a great information.