To dive or not to dive?

Running the boat single handed, following a track and operating the sidescan at the same time does tend to make things a little busy. I leave the analysis till I have time to sit down and go through the data on the big screen at home. Just lately due to the weather I have had chance to start catching up. The image is 75 metres across left to right and shows an area of Stenis ledges west of Portland Bill. On the left of the image you can see a straight line sticking out from the ledge which doesn’t look natural and top right you can see four similarly shaped objects in a group, this also doesn’t look natural. Didn’t see it on the boat, stands out like a sore thumb now. So are we going to dive it? Of course we are that is what the Project is all about, you don't know for sure till you look and you have to be in it to win it.
Click on the image to enlarge.