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How archaeological findings off Florida's coast help future generations prevent sea level rise

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Posted at 3:45 PM, Nov 27, 2023
and last updated 2023-11-27 15:45:40-05

BISCAYNE BAY, Fla. — “I tell people it’s underwater basket weaving, but it’s a bit more complicated than that,” shared Joshua Morano.

Morano is a maritime archaeologist for South Florida National Parks. His love for discovery started with a map of a shipwreck, and 12 years later, he was on a boat working on what would become just one of dozens of archaeological findings.

He stated, “The old cliche right is that if you don’t know history, you are doomed to repeat it.”

It’s a saying Morano uses cautiously, but it’s got truth.

He is part of a small niche field called Submerged Landscape Archaeology. In Florida, that’s comprised of roughly a dozen others.

Morano’s coverage area is 172 thousand acres, 95% underwater, and it’s called Biscayne Bay. Biscayne National Park is home to 170 archaeological sites.

It’s a window into who our ancestors were and their challenges, one of the biggest ones being the rise of the sea level.

“People were cognizant of where the land and the water met. It was very much a big part of their life, where that interaction occurred,” explained Morano.

Much like today, our ancestors, dating back at least ten thousand years ago, tried to harden their resources.

Morano provided an example: “We have a Native American site in the park that actually utilized shell tools, to build rip raft if you will. So, they actually fortified their own shoreline years ago, and because of that, it’s pretty well intact.”

However, the threat of water has made it harder to find these sites and their strategies.

“They are in peril, and a lot of the sites, because of the necessity to be close to water, they are right along the shoreline if not right underneath the water now,” stated Morano. “And so we are kind of in a race against time, needing to prioritize our sites and learn what we can while we can and then decide what sites can we save, and maybe which ones are already lost.”

It’s a sad reality.

Even preserved landmarks like Boca Chita Key, which is barely above sea level, see what those thousands of years ago faced.

While driving the boat, Morano shared, “When we talk about our septic systems, our water lines, how we actually get amenities out here, we’ve seen a lot of challenges. And that’s been exacerbated the last few years with some of these major storm events. Hurricane Irma in 2017, Hurricane Ian just a few years ago.”

Construction is ongoing to repair these historic structures and make them more storm-resilient. However, the real task is learning to adapt.

“That’s the interesting thing with history is that people have always been adapting to what is occurring in South Florida, whether it’s extreme heat, diseases, mosquitos, whether it’s hurricanes. We have always learned how to adapt,” stated Morano. “So what’s interesting is how those people back then reacted to those threats and how we are doing similar work now.”

For example, there is a boardwalk now home to dozens of seabirds. It is now partially submerged after Hurricane Andrew; therefore, no one can walk on it, let alone see it.

The new one that visitors can walk across is already seeing signs of erosion.

A few miles offshore, Morano takes us to a site where they found a ship anchor from a steamboat ship called St. Lucie. It wrecked and killed 26 people during a hurricane in 1906.

It’s an example of artifacts that give insight into not only how we’ve adapted to climate change but also our state’s history.

“The anchor provides that connection not only that particular event, that shipwreck, those 26 people, but that there were workers for Henry Flagler’s railroad,” shared Morano. “So, there were people being transmitted down from the keys to work on the railroad down there and basically building Miami and enabling Miami to be the city that it was.”

A few weeks ago, Morano also found a graveyard of a yellow fever hospital near the Dry Tortugas. They found roughly 60 graves on a submerged island. It’s a testament to the effects of climate change and a picture of a moment in history.

The water and the clues lying both above and below it are indicators of a pattern that’s been happening for centuries.

Today, Florida has spent millions of dollars improving sea walls, coastlines, and infrastructure.

For those in the field, they say there’s no telling how much is still out there to explore. But the more they find, the more answers and possible solutions to help generations today continue to thrive.

“They won’t protect what they don’t care about, and they won’t care about what they don’t know about,” stated Morano. “And that’s really my job here, and the job of the parks service in South Florida. From a cultural perspective, it’s to convey these stories. It’s not necessarily for us to interpret or modify, but it’s to document history out here, and convey that to the public, and get people to care about their local history right here in South Florida.”