This is image is a sidescan image of the whaling ship Fresno. The Fresno caught fire while at dock in 1923 and was a total loss. The ship was scuttled in 180 feet of water in Madenbauer Bay and broke apart either during the sinking or, more likely, impacting with the bottom.
This image was taken with a hull mounted transducer in rough conditions. You can see the waves in the rocky hillside at the top of the image.