I agree it is kind of strange but the water seemed pretty clear and no significant current. If I can get back I will have the thermometer and the aqua vu and I will verify. I still think it will turn out to be a simple change in temperature/ water density. 2d sonar will no detect it unless you run the sensitivity way up.
"Quickly as you can, snatch the pebble from my hand."
"When you can take the pebble from my hand, it will be time for you to leave."


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