Thanks for the reference to the Boothbay waves. I can imagine that the currents we have here create all kinds of eddies and counter currents that can spin off the main flow the way a tiny whirlpool does in the brook behind the house only on a vastly different scale. It also makes sense that the water column experiences these kinds of currents at different levels, too. If something like that sweeps by the seafloor structure at 50 fathoms off Boothbay Harbor and South Port, the energy could get re-directed up into those parallel canyons. It does make it a challenge to be ready. My plan is to stay fit enough to hang on! Ha!