yea I worked on this ship wreck..
http://www.melfisher.org/stjohn.htm
My uncle was part owner of the group that found this wreck and quite a few others in the Bahamas and else where. The guy in the picture is one of the three partners. I tried on the helmet that is in the illustration on that page and I helped bring up a few of the canons.
National Geographic did a few stories on that wreck and another we found same with the discovery channel.