Introduction
Back in 1966 the US developed microwave weapons (or rather, radio weapons more generally) as part of “Project Pandora” which was declassified some time ago such that you can get a copy of some documents via FOIA -- here’s 250 pages of it.
Where did Project Pandora come from? "The microwave irradiation of the American Embassy in Moscow received little publicity until the winter of 1976 instillation of protective screening, but irradiation was known since 1953. [...] The Soviet irradiation of the American Embassy prompted a 1965 White House directive to investigate radio frequency biological effects particularly in the microwave region, that resulted in a major classified project code named Pandora."
Background
Before I say more, do you know how your microwave oven works? In the broadest terms it generates pulses of energy at a frequency that many molecules vibrate at, causing heat. The frequency chosen is particularly helpful for making water molecules vibrate because water is in everything we eat. A medium-sized apple is over 80% water. The human body is something like 60% water. Even a dry powder like wheat flour is roughly 10% water. Microwaves interact with more than just water, though it's helpful to note that our home microwave ovens used for cooking are tuned to a frequency most helpful for interacting with water and by using different frequencies there could be more or less of this heating effect, or other effects, with different materials.
Next it's helpful to understand how getting the right amount of energy at the right time can lead to larger effects, even with a small energy input. Everyone knows how this works intuitively when they push a kid on a swing. If you push at just the right time the kid will go higher without you having to push very hard. If you repeat this again and again you can get the kid swinging quite high without having input very much energy. That's a perfect analogy for thinking about resonance. Have you ever seen a person break a wine glass just by singing? This is accomplished via a resonance effect where the sound pressure wave from the singer's voice at a particular note hits the glass causing it to vibrate and at just the right frequency it vibrates too much and breaks. Yet the same singer yelling much more loudly at the wine glass will not break it. It's not a question of how loud they are, primarily, it's resonance producing the effect (small amounts of energy at the right time / frequency).
Project Pandora included many sub-projects and one of particular note is “Project Bizarre.” In Project Bizarre military researchers found they could elicit various emotional states through low power pulsed radio waves. Although this sounds a little crazy at first, once you start to think about how microwaves interact with water and how much of our body is water, it starts to become clear how carefully-chosen pulses could impact blood flow in the brain in somewhat selective ways, among many other effects. In any case these technologies aren’t a theory — however they work in detail — they’ve existed in reality for longer than most of us have been alive. The USSR developed this before the US did. China developed it later. Any competent university student with an electrical engineering background could make a basic microwave weapon capable of hurting people by weaponizing a microwave oven: it isn’t rocket science. A more sophisticated research lab that understands a lot of about human physiology and a lot about radio energy could produce effects in humans which are much more subtle.
Consider that the US federal government has had "voice to skull" technology since the 1970s that enables them to beam a voice directly into someone's head. The US military and Federation of American Scientists describe it on their websites this way:
Nonlethal weapon which includes (1) a neuro-electromagnetic device which uses microwave transmission of sound into the skull of persons or animals by way of pulse-modulated microwave radiation; and (2) a silent sound device which can transmit sound into the skull of person or animals. NOTE: The sound modulation may be voice or audio subliminal messages. One application of V2K is use as an electronic scarecrow to frighten birds in the vicinity of airports.
There are commercially available devices capable of a similar effect using (inaudible) ultrasonic frequencies which are sometimes called "audio lasers" or more broadly directional loudspeakers. These ultrasonic devices send a narrowly focused beam that can't be heard until it bounces off an object, then at the site where it bounces you'll hear it as a regular audio sound. This is somewhat similar to bone conduction headphones like Shokz that rely on vibrating your cheekbone to transmit the sound rather than using air to transmit sound like regular headphones. Voice to skull works on roughly the same principle as directional loudspeakers, just using different frequencies and relying on your skull to bounce the signal off rather than a table or a wall. Does this sound crazy? It's not, it's a phenomena well-known to modern science called the Microwave auditory effect -- here's it described on Wikipedia:
The microwave auditory effect, also known as the microwave hearing effect or the Frey effect, consists of the human perception of audible clicks, or even speech, induced by pulsed or modulated radio frequencies. The communications are generated directly inside the human head without the need of any receiving electronic device. The effect was first reported by persons working in the vicinity of radar transponders during World War II. In 1961, the American neuroscientist Allan H. Frey studied this phenomenon and was the first to publish information on the nature of the microwave auditory effect.
In 2016 US Embassy personnel in Havana, Cuba, began to report the development of an unusual set of symptoms and clinical signs, later to be called "Havana Syndrome." The US Department of State asked the National Academy of Sciences to review the Havana Syndrome cases, their clinical features and management, epidemiologic investigations, and scientific evidence in support of possible causes, and advise on approaches for the investigation of potential future cases. In short they found that microwave weapons were most likely to blame for the key issues. This is not shocking at all. As mentioned above this same type of thing had happened to US embassy personnel in the Soviet Union as far back as the 1950s, so much so that working in the Soviet Union embassy was considered a hazardous job with extra pay.
Also in 2016 the University of California published research showing how regular WiFi can be used like X-ray vision to see through walls. MIT published similar research a year earlier. Similar experiments before or after those have resulted in varying degrees of ability to see what's inside a room just by carefully monitoring WiFi signals to detect how much radio waves have bounced around or passed through objects before being detected outside (they are subtly weakened or distorted by the objects they interact with, conveying information about those objects that are analyzed by fancy software to produce the kind of X-ray vision effect). Chances are very high that the US federal government has had some variation of this type of technology for a long time, long before these universities started to figure it out. Consider that as far back as the 1940s governments have been experimenting with "laser microphones" capable of hearing a conversation inside a building from hundreds of yards away by directing a laser beam onto window pane or a light bulb of the room people are in and using the laser to measure the subtle glass vibrations caused by people speaking. These type of surveillance systems were commercially available in the 1990s and some spooks have asserted (very plausibly) that the US federal government has used this type of technology operationally since at least the 1980s, and plausibly much earlier.
Radio waves present risks other than direct harm to your physical health. They can be used to look inside your house like X-ray -- to spy on you. They can be used to transmit sound directly into your head -- to drive you crazy.
This background information helps to make clear that we shouldn't be dismissive of the harms that are possible via radio waves, particularly when they're designed to be used as a weapon. So what about 5G? We don't know the full range of effects it produces because it has not been studied hardly at all. Let's assume for the sake of argument that in typical use scenarios 5G is no more harmful than 4G. Even then, 5G presents new risks because of how the technology works under the hood, unrelated to the specific use case it is applied to.
How does 5G work?
Modern radio equipment is software programmable to a significant degree. The hardware is capable of transmitting at many frequencies over a wide range, and it’s via software programming that particular frequencies and power levels are chosen for particular applications. The underlying hardware of the 5G transmitter may be used in entirely different use cases at different frequencies and power levels. Just as you can use a knife to cut an apple or kill a person, so, too, can the hardware which underlies 5G have multiple uses.
A key part of what enables 5G to perform better than 4G is related to “beam forming.” Basically it’s a way for a 5G tower to focus the radio waves into a small area around where your phone is, rather than wasting transmission power broadcasting in all directions. It's also the case that a single 5G transmission station will have many transmitters, to talk with many customers at once.
In broad strokes your mobile phone provider owns 5G radio broadcast towers which themselves are connected via land lines (e.g. fiber optics) back to a central network. There have to be a lot of broadcast towers to provide good mobile phone coverage even for 4G, and much more-so for 5G (each tower has much less reach with 5G compared to 4G, so many more towers have to be deployed). Because so many broadcast towers have to be deployed each is as simple and minimalist as possible so as to reduce costs to deploy and maintain. To slightly over-simplify, a broadcast tower is made up of a small server which has several radios connected to it for talking to mobile phones, and one fiber optic connection back to headquarters. This server is managed by your mobile phone company. The software that runs on this server has a role in authenticating your phone to the mobile network (i.e. to make sure you've paid for service), keeping track of how much bandwidth you've used throughout the month, and rate-limiting people as needed to preserve quality of service for the most people. The details of how this works aren't important. The key thing to know is that when you're using your mobile phone it is talking to the nearest broadcast tower and your communications are passing through that server I'm talking about. Periodically these servers need software upgrades to add new features or fix bugs: this capability is key to understanding some of the risks posted by 5G.
How could 5G be weaponized?
A few basic examples:
- The power available for transmission at each 5G station is sufficient to cause harm if the equipment malfunctions or is hacked into in a nasty way, e.g. such that multiple radio transmitters are running at maximum power, using beam-forming, focused on you.
- Even at low power levels there is the potential to produce biological effects and psychological effects by using carefully crafted pulsed signals. 5G doesn’t normally do this, but if someone nefarious gains control of the equipment they could reprogram it to do this. A pulsed signal at microwave oven frequencies pushes around water and blood in your body. Done cleverly, this can produce temporary negative effects like tiredness or agitation, for example.
- The beam-forming and higher frequency signals likely produce secondary effects that enable new types of surveillance. Look at what researchers have been able “see” inside a house only by monitoring regular WiFi signals as they bounce off stuff inside your house — it’s creepy, like X-ray vision. 5G would be useful for this same trick with much higher resolution and pervasive coverage. In the worst case, after 5G rollout the NSA (or China, etc) will be able to see inside every home as if they had a video camera in every room.
- Dr. Martin Pall also posits that 5G in its normal use case could have health risks ranging from depression to cancer, see this video and this article.
- There's a non-zero possibility that some of the nanoparticles deposited around the body by the recent COVID-19 vaccine campaign could be used for neuromodulation. I know how crazy that sounds, and personally I consider it unlikely. Though it's definitely not impossible and so it's irresponsible not to consider such risks -- read the link and decide for yourself.
Conclusion
5G has barely been studied at all by the open scientific community and the few studies that have been done were primarily by partisans. Many of the potential risks associated with radio waves in general have been known about for half a century at this point. That's not to say they're always dangerous (they're not), just that they can be used to cause harm, intentionally and unintentionally, and we shouldn't be lulled into a false sense of safety and security about what radio technology can do. 5G in particular has new technical features under the hood that both make it better and create new opportunities for misuse or unintentional harm.