As two curious spotted eagle rays cruised by, a group of divers from the Washington-based Maritime Archaeological and Historical Society surveyed the unidentified wreckage that hurricanes, tropical storms and strong currents have scattered over a site larger than a football field.
Is the submerged debris field primarily a single wreck, perhaps one of the 23 ships with names that include Lion, Mimi, SS Oxford and Hope of London that Key West Admiralty court records document as sunk, abandoned, lost or wrecked on that reef in the 1800s? Or is it the remnants of several wrecks, from different eras?
And are the numerous cement cylinders even connected to the wreckage? Or was it cargo a boat's crew offloaded to lighten the load enough to get off the treacherous reef, which at some points is less than 10 feet deep?
“We don't know, but we have enthusiastically been trying to pin this wreck down for a number of years now,” said Brenda S. Altmeier, program support specialist with the Florida Keys National Marine Sanctuary - in which the wreck site is located.
Over the last few decades, the prevailing story told to divers and snorkelers has been that the wreck is that of a Civil War-era ship or barge that was carrying cement headed to Key West for the construction of Fort Jefferson or the Martello Towers.
But that story was debunked in 2008 after a New York laboratory's analysis of the cement positively identified it as Portland cement, produced no earlier than 1890 and only until 1925.
“This information leads us down a different trail of bread crumbs,” Altmeier said. “We can eliminate the Civil War era ships.”
One of the new theories is that the vessel was carrying cement for construction of the Key West Extension of the Florida East Coast Railway. The maritime society located a 1908 picture of construction of a Henry Flagler railroad bridge that clearly shows neat rows of barrels that appear similar to the shape of the cement features at the bottom of Pickles Reef. Workers also appear to be pouring concrete next to the barrels. But so far, it's just a theory.
With so few government resources, and 68 priority shipwreck sites to identify just in the Upper Keys, Altmeier says the sanctuary welcomes the help of enthusiastic private groups like the Maritime Archaeological and Historical Society, providing them with permits and previously gathered information.
The society began to investigate the site at Pickles Reef in 2010, at the request of Florida State Underwater Archaeologist Roger Smith. The group has returned each year since, gathering more clues both underwater and on land, working with local historians and combing through archives.
Originally, Anthony said, the group wasn't convinced it was the site of a shipwreck. “It looks like a big debris field and we thought it could be machinery and maybe offloaded salvage,” he said.
The group, with no trained underwater archaeologists, asked the sanctuary for help in interpreting their photographs, drawings and maps created by their survey work.
Last September, underwater archaeologist Matthew Lawrence of the Stellwagen Bank National Marine Sanctuary looked over their work and dove to the site. He concluded that there were lower hull remains of an iron or steel sailing vessel.
He also located two mast steps, which Anthony described as rectangular slots in which the masts were connected to the ship. “In the old days they put a coin in there to tell the date of the ship - and for good luck,” he said.
The mast steps also indicate the wreck is either a sailboat or schooner.
On the first dive last week, Anthony easily found the first mast step. But he could not find the second one until the second dive. It was partially hidden under coral.
Meanwhile, the rest of the group laid a baseline of measuring tape down the center of the site and used the trilateration method to measure several of the site's metal features to later be placed to scale on a map.
They also tried to estimate the number of barrel-shaped cement features that were on the bottom. Archaeologist Dennis Knepper, vice president of the society, said he saw between 30 and 50.
“That does not seem like it is quite enough to be on a barge, unless a lot of it deteriorated,” he said. “The only ones we're seeing are the barrels that remained intact long enough for the cement to harden before the wood deteriorated.”
Knepper usually works on land sites slated for development. In one freeway project near the Watergate Hotel in Washington, he found prehistoric sites and plowed fields from tobacco farms buried under 14 feet of fill. “It was intriguing, but they still built the ramp over it,” he said.
Part of the society's mission is to enhance the public's awareness and appreciation for historic shipwrecks. Anthony hopes this awareness will help encourage charter boat captains and divers and snorkelers to view these sites more as underwater museums than as treasures to be seized.
Anthony would like to see the Pickles Reef wreck site one day added to the Florida Keys Shipwreck Trail, which now includes nine wrecks with interesting tales to tell.
“It's a cultural resource we want to protect,” Anthony said. “You can do that by capturing the imagination of the public by telling the story of how much terror and fight and struggle to survive there was for the people on that ship that smashed into the reef.”