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A comment on The Daredevil Camera. Parent comment
http://blueprintsubsea.com/starfish/images/sonar/452/sf452_s...
That's just one example - look for side scan sonars for the earliest stuff (https://en.wikipedia.org/wiki/Side-scan_sonar) or sonar imaging for the latest stuff (http://www.tritech.co.uk/product/gemini-720i-300m-multibeam-...)
https://en.wikipedia.org/wiki/Fishfinder
http://blueprintsubsea.com/starfish/images/sonar/452/sf452_s...
That's just one example - look for side scan sonars for the earliest stuff (https://en.wikipedia.org/wiki/Side-scan_sonar) or sonar imaging for the latest stuff (http://www.tritech.co.uk/product/gemini-720i-300m-multibeam-...)