The above 500 kHz image clearly shows the submarine. Bow is to the right, stern is to the left. It appears that the hull was crushed just behind the center conning tower. The dark contact to the left and behind the conning tower is a large fishing net that was snagged on the submarine. The line of depressions dropping off in front of the submarine were most likely formed by trawler doors skipping across the bottom.
The image below was inverted and slightly colored to enhance detail