We are looking for a technology that would allow us to search under possibly up to 10-15 feet of mud or sand....I imagine an x-ray that will work in 0-500? feet of water. We have a sailboat in Panama and stories of lost ships abound. And Drake's "leaded" coffin has never been found. I don't know what technologies would be available to assist in these pursuits and/or if we could even afford them, but I am interested in any info that could give us a place to start. Thank you. Brad