More terrain shots
The depression image is a shot in Alton of the sonar beam going over the top edge of what is basically a hole; The dark area is the hole itself on the backside/left side, of the edge of the embankment.
Don't know how the scour marks were created; One poss. is from anchor drag but that's alot of anchors doing alot of dragging. I just don't know for sure.
The mooring block image shows both the hole in the block itself and links in the chain-the alternating light/dark sections as it trails off to the right of the block.
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