Plum Island: A History

By Rupert Deedes

The history of Plum Island is rich and varied, with changing times, historical context, and national challenges changing the use of the island and its purpose.

Here are highlights of the Island’s history:

Colonial Background, 1640s–1700s: Plum Island is incorporated into English colonial land grants on Long Island’s North Shore. The island is Used mainly for grazing livestock, fishing access, and maritime navigation reference

American Revolution, 1775–1783: No major battle occurs on the island, but it sits inside a strategic maritime corridor between Long Island, Connecticut, and New England ports

British Naval Control, 1776–1783: After occupying New York City, British forces dominate Long Island Sound. Plum Island was likely used for naval observation, anchorage, and patrol support.

It also served as part of Britain’s blockade network against colonial shipping.

1783–1812: The island is returned to private use, and is mostly used for agricultural and maritime business. There is no permanent federal presence on the island.

War of 1812: The British fleets again control Long Island Sound, and the vulnerability of eastern Long Island becomes clear. This leads directly to later coastal fortification planning.

1815–1880s: The island is privately owned and used for fishing stations, small farms, and navigation markers. No major infrastructure is built on the island.

Strategic Reassessment (late 1800s): The rise of steel warships and long-range artillery increase U.S. fears naval attacks on New York and New England.

Spanish–American War as a Catalyst (1898): The War exposes weakness of U.S. coastal defenses. Congress authorizes major harbor fortifications.

Establishment of Fort Terry. In 1899 the U.S. Army acquires Plum Island, and Fort Terry is constructed as part of the “Endicott System.” The purpose of the fort was to protect Long Island Sound, the approaches to New London, and the eastern routes to New York Harbor.

Infrastructure (1899–1915): The firs fifteen years of the 20th Century saw the building on the island of concrete gun batteries, ammunition depots, barracks, searchlight stations, and submarine mine controls.

Early 20th Century Military Role, 1900–1918: The island is manned by the United States Army, which places large-caliber artillery on the island to help guard shipping lanes.

Interwar Decline, 1920s–1930s: Following the First World War, the fortifications on the island became obsolete as new aircraft and submarines reduce usefulness of shore facilities. The Army’s garrison on the island is reduced.

World War II Reactivation, 1939–1945: Fort Terry reactivated, and anti-submarine defenses, radar and coastal surveillance, and training facilities are built.

Postwar Demilitarization, 1946–1951: The coastal artillery deemed is deemed obsolete, and the Army abandons most installations, allowing the buildings on the island to deteriorate.

Cold War & Biological Security ConcernsEarly 1950s: Growing fear of Soviet biological warfare, agricultural sabotage, and livestock epidemics lead to the U.S. government reconmsideration of the island’s usefulness.

Selection for Biological Research, 1952: Federal government selects Plum Island for high-containment research for its natural isolation, military security legacy, distance from major cities, and existing, if dilapidated, infrastructure.

Transfer to Civilian Agency, 1954: Control of the island is transferred to the United States Department of Agriculture. USDA establishes the Plum Island Animal Disease Center (PIADC).

The mission of PIADC was the study foreign animal diseases, especially Foot-and-mouth disease, African swine fever, and Rinderpest – and protect U.S. livestock industry.

The lab was built on top of—rather than replacing—the abandoned military base.

The Biolab Era (1954–Present)Establishment and Early Years (1954–1970s): The Opening of the Plum Island Animal Disease Center (PIADC), operated by the United States Department of Agriculture. PIADC’s primary mission is defined as studying “foreign animal diseases” not present in the United States, especially foot-and-mouth disease (FMD).

PIADC, a high-containment labs (pre-BSL system, later BSL-3/4–equivalent) becomes the U.S. only large-scale FMD research site.

Cold War Context (1960s–1980s): Work at PIADC focused on vaccine development, diagnostics, and emergency response. The lab also served as part of national defense against agricultural bioterrorism and state-sponsored sabotage of the U.S. food system.

Post–Cold War Expansion (1990s–2001): The research at the lab is expanded to include African swine fever, classical swine fever, and Rift Valley fever, and there is an increased collaboration with universities and state agencies. But the aging infrastructure is becoming a growing problem.

Homeland Security Era (2003–2015). In 2003 the control of the lab is transferred to the Department of Homeland Security, and the mission expanded to include terrorism-related bio-threats, agro-terrorism scenarios.

Security at the lab has also increased to include armed patrols, restricted airspace, and upgraded perimeter systems.

Decline and Drawdown (2015–2025). The age of the facility is catching up with it. The facilities become increasingly obsolete, leading to rising maintenance costs – and to the gradual transfer of functions to mainland sites.

By early 2020s the core research at the lab is largely phased out, and the island is heading toward closure,

Safety and Containment Incidents at Plum Island (1954–2020s)

Over the years, there have been several safety accidents, and less severe incidents, on the island.

The lab on the island did not experience a catastrophic mass-release event, but it accumulated a significant record of containment lapses, infrastructure failures, and compliance problems, especially from the 1980s onward.

1. 1978 Foot-and-Mouth Disease Containment Breach (wastewater System)Date: 1978 (internal USDA documentation; later referenced in GAO reviews)Issue: Inadequate effluent sterilization

PIADC’s wastewater decontamination system was designed to chemically treat liquid waste before discharge. In 1978, inspectors determined that certain effluent streams bypassed full sterilization; monitoring systems were not consistently calibrated; and treatment records were incomplete.

The concern was not that FMD escaped and caused an outbreak — it did not — but that effluent controls were technically insufficient for the pathogen risk level being handled.

The problem triggered system redesign and procedural reform in the late 1970s.

2. 1990s: Infrastructure Decay and GAO WarningsKey period: 1993–2003Oversight body: U.S. Government Accountability Office (GAO)

Multiple GAO and Inspector General reports identified cracked containment seals; deteriorated negative-pressure systems; corroded waste pipes; and roof leaks above laboratory zones

A 2003 GAO review warned that parts of the facility were “approaching structural failure,” and that containment reliability depended heavily on manual vigilance rather than engineering redundancy.

This was not a single dramatic event, but a systemic vulnerability: a high-containment lab operating inside mid-20th-century retrofits of early 20th-century military buildings.

3. 2004–2005 Power and Ventilation FailuresDates: August 2004; January 2005Agency in charge at the time:After transfer from USDA to DHS in 2003, the facility experienced backup generator failures during storms; temporary loss of negative-pressure containment; and emergency activation of manual sealing procedures.

No pathogen release was documented, but the episode demonstrated that redundant power systems were aging; ventilation integrity was not fail-safe; and that severe weather posed systemic risk.

This became part of the policy argument for relocating high-risk animal disease research inland.

4. 2008 Flooding and Storm IntrusionDate: 2008 (storm-related flooding)Plum Island’s coastal siting created exposure to storm surges; basement flooding; and saltwater corrosion.

Flooding affected lower mechanical spaces that supported containment systems. Although pathogen zones remained intact, the event reinforced the vulnerability of a coastal, aging facility in an era of intensifying storms.

5. Occupational Safety Complaints (1980s–1990s)Former workers alleged inconsistent respirator enforcement; incomplete vaccination compliance; and poor carcass disposal procedures.

Some complaints were documented in internal reviews. None established deliberate misconduct, but they revealed a workplace culture that was stretched by budgetary and structural limits.

Assessment of Plum Island IncidentsPlum Island’s pattern was not catastrophic release but chronic engineering fragility.

Its vulnerabilities were related to infrastructure age; environmental exposure; deferred modernization; and heavy reliance on procedural compliance.

It never experienced a massive accident like the April 1979 accidental release of anthrax spores at the Soviet biolab at Sverdlovsk— but it operated closer to its engineering limits than comparable modern facilities.

COVID-19 and the Modern Biolab Safety DebateThe safety incidents which had accompanied the Plum Island facility since its inception were echoed in the debate over the origins of the COVID epidemic.

The controversy over the origins of COVID centers on the possible role of the Wuhan Institute of Virology and the relationship between the research performed at the institute and the origins of COVID-19.

Regardless of where one comes down on this question of the origins of the epidemic, the debate highlighted structural issues that are directly relevant to Plum Island:

Shared Risk FactorsAcross Wuhan, Plum Island, and other high-containment labs:

●  Work with novel/high-risk pathogens

●  Human error

●  Equipment failure

●  Incentives to downplay incidents

●  Political sensitivity

The COVID debate made visible something specialists already knew: No biocontainment system is zero-risk.

Institutional Transparency

One of the central criticisms in the COVID debate was:

●  China delayed access to records

●  China restricted inspections

●  China limited disclosure

This contrasts with (imperfect but real) mechanisms in the U.S.:

●  GAO investigations

●  Congressional hearings

●  Media reporting

●  FOIA information releases

Plum Island benefited from these, even when they were uncomfortable.

Policy ConsequencesAfter COVID:

●  Governments reassessed lab oversight

●  Emphasized biosafety culture

●  Tightened reporting rules

●  Increased funding for containment upgrades

The decision to replace Plum Island with NBAF looks prescient in this light.

Conspiracy Theories vs. Documented HistoryPlum Island has attracted more conspiracy theories than almost any U.S. research facility. Among them:

Lyme Disease Origin Theory

●  Claim: Lyme disease was engineered or escaped from Plum Island.

●  Often linked to Lab 257.

Evidence:

●  Lyme disease identified in Connecticut (1970s)

●  No credible proof of weaponization

●  Genetic evidence points to natural evolution

Assessment: Not supported

Offensive Bioweapons Program

●  Claim: Plum Island ran secret weapons research.

Reality:

●  US offensive bioweapons ended in 1969, on President Nixon order

●  Plum Island focused on animals, not humans

●  Records show defensive research

Assessment: Limited classified work, but no evidence of weapons deployment

Deliberate Disease Releases

●  Claim: The government tested diseases on civilians.

Reality:

●  Documented lab accidents occurred

●  No evidence of intentional release

●  USDA/DHS incident reports exist

Assessment: Unsupported

Nazi Scientists and “Dark Science”

●  Claim: Former German scientists ran secret programs.

Reality:

●  Some German scientists entered US programs (Operation Paperclip era)

●  None documented as running Plum Island bioweapons programs

Assessment: Largely mythologized

Why Conspiracies PersistThe Island and the work on it appear to be a perfect setting for conspiracies theories: The secrecy surrounded the research work; the island isolation; the military ruins; disease outbreaks nearby; and limited public access.