The weird-looking lump below is actually a concretion, which is a combination of rust, shell, marine organisms, calcium carbonate, and other materials that form a layer around iron objects as the iron oxidizes and reverts back to its natural state. Concretions are usually more irregularly-shaped than rocks, and this one gave a spike in the magnetometer data. I might have been seeing what I want to see, but upon closer inspection it looked to me like there were cannonball shapes in this one.
Perfectly linear shapes in nature are rare. That's why we always hear that when someone is stranded on a deserted island, they make patterns or spell out words in the sand to indicate to aircraft that there are humans present. We apply the same theory beneath the sea, and look for things that appear unnatural in the seabed. The image below is of another likely concretion hiding some man-made object:
This white soft coral is most often the best clue to indicate buried objects. In the image below, there appears to be a long length of wood buried just under the surface, so there is more to this site than meets the eye. It is a mostly buried wooden shipwreck with some iron objects present.
We have a summer expedition planned to learn more. The Ocean Technology Foundation's ability to successfully manage and lead this search has been made possible by our wonderful donors and a lot of in-kind support, but we need support now more than ever. When we are able to prove that we've found the Bonhomme Richard, there will be opportunities for major publicity for our sponsors, and it will all happen fast! Join us in this great maritime quest and become a sponsor!