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an underwater drone sounds interesting.

Shoals of them portends a renaissance in archeology.

I can't wait!

Something like this?

I realize it's a video, but you may find the intestinal fortitude to power through it once, to see the robodog bottom feeder drone.

video won't play for some reason
perhaps it's not playing pretty with some of my malware prevention apps.

Well, it's a robodog bottom feeder drone. National Geographic has the video if you wanna see it.

There's some advantages a bottom walking robot has over swimmers, I think primarily the far lower expenditure of energy when on the bottom, to take samples, etc...