Fears of World War III are spreading across the globe amid military tensions.

But a recently declassified document claims it already happened — under our noses and in the US. 

Two investigative journalists penned a 1985 manuscript that exposed the secret warfare tactics used by world governments, including America's

The work, titled 'The Invisible World War', focused on psychological operations, mind control, and the use of electromagnetic and biological weapons.

The covert attacks were carried out by 'a secret-CIA Army,' which unleashed plagues, bacteria and nerve gas in Hawaii, Alaska, New York, Florida and California from 1949 to 1969 during these covert experiments that killed more than a dozen people.

The experiments on American soil were to test the Army's new warfare tactics and vulnerabilities in America's largest cities that would be target during the Cold War.

They describe it as the invisible war because the bioweapons were being developed without knowledged and could not be detected 'at the very moment they are murdering or robotizing civilian populations.'

In one of the most famous examples, the US Navy sprayed massive amounts of bacteria into the air coast of San Francisco in 1950, which resulted in the death of one American.

The manuscript explained that following WWII, the US wanted to explore weapons that did not lead to a nuclear holocaust.

The authors explained that officials realized 'the only safe way to wage war... was to wage it silently.'

'Invisible Warfare - or IW, as it came to be known - became a necessity,' he added.

'Not only have these weapons been developed without the knowledge of their intended victims, but, worse, they cannot even be detected at the very moment they are murdering or robotizing civilian populations.' 

DailyMail.com has reached out to the CIA for comment. 

One of the authors, Walter H Bowart is known for his work 'Operation Mind Control' that investigates the history and alleged use of drugs hypnosis, psychological conditioning, and electronic stimulation in the CIA's MKUltra program.

While 'The Invisible Third World War' was never officially published for the public, portions of it are available on the CIA's FOIA Reading Room.

The outline features what Bowart and his co-author, Richard Sutton, hoped to share with the American public. 

The report, however, had sensitive information removed when it was released on the CIA website.

But it included a section that details a 'number of experiments conducted on unwitting citizens by the US government.'

It states that the CIA Army used 'trick suitcases and a 1954 Mercury equipped with dual mufflers and extended tailpipes' to release bioweapons in New York City.

The Washington Post published an article in 1979, also found on the CIA website, which claimed the Church of Scientology found records of the attack.

'The CIA may have been involved in 'open air' biological warfare tests in streets and tunnels in New York City are in 1955 and 1958,' the Washington Post wrote.

The analysis included about 600 pages about the agency's MKUltra program, conducted from 1953 to 1964, which aimed to develop procedures and drugs that could be used during interrogations, weakening individuals and forcing confessions through brainwashing and psychological torture.

And many of the subjects were unsuspecting Americans. 

The church, which included the group called American Citizens for Honesty in the Government, claimed it uncovered information about 'Operation Big City' during its investigation.

Brian Anderson, the then Church of Scientology spokesperson, said: 'Equipped with tes animals, the CIA-Army team experiment with a variety of devices capable of disseminating a powder or gas into the air under covert conditions.

'Battery driven 'dusters' were installed in suitcases that had been soundproofed to muffle the noise. Similar devices were also constructed to sample the air to determine the effectiveness of the test. Personnel were protected with, at least nasal filter pads.' 

The Naval attack in 1950, codenamed 'Operation Sea Spray' used a secret biological warfare experiment to learn how vulnerable large US cities like San Francisco would be to a biowarfare attack by terrorists.

The bacteria used were Serratia marcescens, which can cause respiratory issues and meningitis, and Bacillus atrophaeus that can be lethal immunocompromised individuals. At the time, the Navy believed these bacteria were harmless to humans.

But when Bay Area residents began rushing to the hospital, it became clear that was not the case.

After inhaling thousands of bacterial spores, 11 people checked into Stanford Hospital near San Francisco with very rare, serious urinary tract infections that doctors ultimately determined were caused by the experiment.

One patient, a man named Edward Nevin who was recovering from prostate surgery at the time, died.

'Attacks in Florida were followed by an epidemic of whooping cough in which 12 persons died,' the document reads.

The Washington Posts also published an article about the event in 1979 after the Church of Scientology claimed to have analyzed CIA records. 

The group said the CIA used a specimen of whooping cough bacteria held at Fort Detrick in Maryland and it was later 'used in tests conducted in the Tampa Bay are nea Sebring,' according to the Scientologists' report.

Medical records at that time showed whooping cough cases increased to 399 and one death in 1954 to 1,080 and 12 deaths a year later.

A spokesperson for the CIA told the Washington Post that the agency had no comment on the report.

However, CIA records showed the agency 'paid for boots contaminated during testing.' The boots were 'purchased in Sebring.'

The last invisible wars detailed in Bowart's report took place in Alaska and Hawaii.

The Associated Press published an article detailing how documents showed that more than two dozen tests of biological and chemical weapons were much more widespread than the military has acknowledged previously.

The Pentagon's records showed the tests were part of Project 112.

Devil Hole I and II took place in Alaska, with the first using sarin gas dispersed from artillery shells and rockets. Sarin is a powerful nerve gas that causes a choking, thrashing death.

The tests occurred in the summer of 1965 at the Gerstle River test site near Fort Greeley.

Devil Hole II used the nerve agent VX, which is a chemical formula that inhibits the enzyme involved in nerve signal transmission.

VX is one of the deadliest nerve agents known and is persistent in the environment because it is a sticky liquid that evaporates slowly.

This test included mannequins in military uniforms and military trucks.

Big Tom was carried out over the Hawaiian island of Oahu in 1965.

The military sprayed bacteria to simulate a biological attack on an island compound and to develop tactics for such an attack. The test used Bacillus globigii, a bacterium believed at the time to be harmless.

Researchers later discovered the bacterium, a relative of the one that causes anthrax, could cause infections in people with weakened immune systems.

The Defense Department acknowledged in 2002 for the first time that some of the 1960s tests used real chemical and biological weapons, not just benign stand-ins. 

Following these tests, the US crapped its biological weapons program in the late 1960s and agreed in a 1997 treaty to destroy all of its chemical weapons.