I replayed that recording and boosted the SI sensitivity up. The dark areas never really got brighter while the rest of the floor did so I'm pretty sure they are not rocks. Seems to be better at absorbing the sonar energy than the rest of the area.
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I replayed that recording and boosted the SI sensitivity up. The dark areas never really got brighter while the rest of the floor did so I'm pretty sure they are not rocks. Seems to be better at absorbing the sonar energy than the rest of the area.
Yes, I was talking to myself; sometimes even I have to ask for expert advice.