You can't remove any historical resources within the Sanctuary, which is the entire Florida Keys. You also can't disturb the seabed at all, which includes hand-fanning I have been told. Don't risk arrest, as well as losing your boat and everything in it.
I was going to suggest metal detecting at Anne's Beach aka Treasure Beach at mile marker 73, in Islamorada, but now I am not sure if even that is legal.
Bob Frogfoot Weller wrote this:
Today we have another "treasure beach" in the Florida Keys. This storied beach goes back to 1965, two years after we salvaged El Lerri, a 1733 merchant nao that sank about one mile offshore of Lower Matecumbe. We hadn't found that much on El Lerri, even though it was one of the largest merchant ships of the fleet. It was a huge ballast pile, rising almost six feet above the sand and covering a good 125 feet by 45 feet of hard coquina bottom. The huge 14-foot anchor was given to Dick Bartlett, who owned what is now Cobra Marina on Windley Key. Today the anchor rests against the front of the building, a reminder that we worked hard moving ballast without a lot of glitter to show for it. That may be because the top decks came ashore over a mile away, carrying the personal belongings of some wealthy Spanish merchants on their way back to Old Spain.
As it turns out, Ray Manieri and I were working the area around Sombrero Light off Marathon in 1965. I had my 16-foot wooden Mohawk boat Frogfoot on a trailer, and we were staying at the Siesta Motel on US#1 in Marathon. On this Particular morning as we were hitching up Frogfoot to the back of my car, a father and son staying at the motel came up and started a conversation that began, "We understand you're treasure divers!" They wondered if there might be a place that the father, his wife and son might look in shallow water and find something from an old shipwreck. they were visiting from up north, and Florida was getting all kinds of publicity about the shipwrecks we were finding. We answered that if they were to drive up to a sign along the side of the road that said , " Yankee don't go home!" and signed Jerry Eagan - Real Estate. "If you park your car there at the sign and walk out about 150 feet, where the water is about two or three feet deep, you might find something That was about where we figured the El Lerri top decks came ashore. They thanked us as we hitched up Frogfoot, and we were on our way.
It was a long day on the reef and close to dark when we pulled up to the Siesta Motel. Before we were even out of the car the father, his wife, and son came out of the Motel carrying a plastic container full of water. They were grinning from ear to ear. "We went right where you told us to go...and look what we found!" In the bottom of the container lay a dirk, two silver pieces-of eight, and a very valuable "pillar dollar". After a lot of handshaking, and shaking of our heads, they pressed $50 on us for gas for the boat. I am sure they went back up north with a lot of treasure tales to tell. We were both wading around "Treasure Beach" the next morning in three feet of water!
Now fast-forward to February of this year. I had my San Jose team ( Joe Kimbel, Doug Gossage, Bill Brohm, Brad and myself) staying at Bernie Smith's house on Lower Matecumbe, about two stones throw from treasure Beach. We were working on my search lease for the 1733 missing galleon San Fernando, and I had my 40-foot Striker search boat docked behind the house. After ten days of fairly decent conditions, the weatherman decided e would take a winter vacation, and he took the weather with him. The wind was blowing, the white caps were dancing, and we were sitting around looking at four walls and truing to decide if another trip to Key West was in order. It was then that I told the group about Treasure Beach and our 1965 episode. It seemed to arouse the sleeping giant that treasure has a habit of doing That day Brad and Rob Barfield searching Treasure Beach. They didn't find much that day, a spike or two, and Rob had to catch an early morning plane back to Atlanta. Brad returned early that next afternoon. It was then that he found a beautiful piece of gold jewelry with four gorgeous green emeralds. It was definitely a 1733 artifact, one that started a stampede to the beach the following morning by all of us. We found a few spikes and a lead musket ball or two, but nothing that glittered except modern silver coins dropped by bathers.
As the Summer Salvage 2000 got underway in May of this year we were back at Bernie Smith's house, rented for the entire summer. There were days in July that the weather kept us off the site. It was during those days that the pilgrimage to "Treasure Beach" began anew. Rob Barfield an I were working the area between High tide and Low tide at "Treasure Beach". I had moved the search area about 300 feet further north from the location Brad had recovered his gold jewelry. We both had no inclination that Pandora's treasure box was about to open. I spotted the first glint of gold. It was a small section of heavy gold chain 2-1/4 inches long! I waved Rob over and showed him the treasure, and with renewed interest both of us started working the area with a fine tooth comb. It wasn't long before Rob came up with another section of gold chain, this one a little over six inches long. Before the day was over I recovered another section--all apparently from the same original chain--this one 11-1/2 inches long. It was dark outside when we finally gave up for the day. The celebration came later as we showed the chains to the rest of the group.
About a week later, a break in the action allowed me to take a few hours off and work Treasure Beach. I began working just north of where Rob and I had found the first sections of chain. Within ten feet of our last hole I found another section of chain, this one 16-1/2 inches long. Before I could catch my breath I had another section that measured eight inches. This was heady stuff. I began wondering how long the original chain could have been? I had started late, and dinner was waiting. The chain had been there for 267 years, it could wait another day or so.
The following day I started near where I had recovered the last section of gold chain, I had dug about three holes when the first links of gold chain appeared. I stopped, stood up and called everyone over to see "what they were looking for!" They all had a chance to see the first glimpse, no more than two or three inches, of gold chain. I then stood up, and stretched out what was 26 inches of encrusted gold chain! It started a flurry of activity. Before the group had scattered very far I found another section of gold chain! I couldn't believe it. This one was 19and 1/2 inches long. I soon had a lot of company in that area.
Totally we had recovered about 90 inches of 24-karat gold chain that was obviously from El Lerri. Each section had some coral encrustation, an at one time I am sure it was a single chain that had been broken as the hurricane brought the ship ashore.
Good luck. Tom