19th century quarantine hospital and cemetery found on sunken island in Florida

National Parks Service

At a remote island park off the coast of Florida, researchers have made a stunning discovery: the remains of a sunken quarantine hospital and cemetery dating back to the late 1800s.

A team including the staff of Dry Tortugas National Park, the National Park Service (NPS), the Southeast Archeological Center, and a University of Miami graduate student happened upon the ruins as part of a 2022 survey, according to the NPS.

“This intriguing find highlights the potential for untold stories in Dry Tortugas National Park, both above and below the water,” Josh Marano, maritime archeologist for the south Florida national parks, said in an NPS news release. “Although much of the history of Fort Jefferson focuses on the fortification itself and some of its infamous prisoners, we are actively working to tell the stories of the enslaved people, women, children and civilian laborers.”

Researchers discovered the ruins of a 19th century hospital and cemetery off a remote Florida island (National Parks Service)

The researchers believe the sunken site was once home to a quarantine hospital used to treat yellow fever patients, mostly soldiers serving at nearby Fort Jefferson.

Historical records indicate “dozens” of soldiers may have been buried at the cemetry.

Among those buried at the former Fort Jefferson Post Cemetery was John Greer, who documents identify as a labourer at the fort. He died on 5 November, 1861.

An unsigned watercolour shows a hospital and cemetery located near Fort Jefferson (National Parks Service)

The striking hexagonal Fort Jefferson, known as the Guardian of the Gulf, was built between 1846 and 1875, and was used during the Civil War as a harbour for Union ships, as well as a prison for deserters.

As people filled the military installation, communicable diseases spread quickly, killing “dozens” of people in the 1860s and 1870s, according to the NPS. Quarantine hospitals like the one uncovered by researchers likely saved hundreds of lives.

Researchers have identified labourer John Greer as one of the dozens likely buried at the site (National Parks Service)

The disappearance of the facility is also a reminder of the impacts of climate change in the Florida Keys, according to the researchers.

“While the facilities identified in this survey were originally built on dry land, the dynamic conditions caused many of the islands to move over time,” the NPS added in its release announcing the discovery. “Climate change and major storm events have even caused some islands to settle and erode beneath the waves.”