Found some images
I dug into my files and came up with pictures from the Ctr. Harbor wreck and one sonar shot-Melvin Bay.
If you use the scale at the top of the sonar shot you can estimate the length rather well. Each increment is in meters. Sonar software measuring tool also had it at about 15-16 feet long.
Using the scale in the image, last image if they posted in the order I did them, pencils out to about 15+-.
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