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In this series I'm mulling, kaiju have been around since prehistory, turning up off and on right up until modern times. In the near-future of this alt-history, say in the next twenty years (2040ish), measures have been taken to minimize damage kaiju inflict on cities. In no particular order, here's stuff I've come up with:

Kaiju are always tracked via satellite that monitor all known/registered kaiju, 24/7; some kaiju are recognized via computer records, digital reconstructions of their appearance, but others are tracked the old-fashioned way, tagged like wildlife. Automated systems alert populated areas whether or not a kaiju is close by. Unregistered/new kaiju can almost always be detected by the same monitoring systems, due to size, ambient energy levels, radioactivity, etc. These systems may also carry nuclear payloads, railguns, laser cannons, etc., Star-Wars-space-program-ish kinds of tech on-board, in case defenses on the ground don't work.

Warning systems are in place in cities to keep people informed well ahead of time, in case an attack is imminent. There are regular kaiju forecasts like weather reports on TV, and warning systems on personal devices like you might receive an Amber alert, etc. Being as kaiju are an everyday part of human life in this alt-history, it's second nature for people to keep tabs on kaiju anyway.

The electrical grid is decidedly more diverse than it is now. The move to clean energy happened a long time ago, and basically any means to get it was okayed, depending on the need: solar, wind, geothermal, kinetic, etc. There are nuclear power plants, based on new improved tech (vaguely tokamak design), but there might be contention over it, since there are some kaiju in this universe that are drawn to nuclear energy. Although with these power plants, the "walk-away" functions allow for people to leave their stations immediately to evacuate, and ideally, leave little damage to the environment afterward. The point is to make the grid less centralized in case of attack, so the city doesn't suffer complete loss of power, but can continue functioning as if nothing has happened (especially underground, but I'm getting to that).

City defense systems begin several miles outside of city limits, in the wilderness or barely populated areas. Concealed [rail]gun turrets, for example, that pop up and fire upon approach by anything over a certain height or tonnage. Military bases, posts, garrisons, patrols, some military presence to keep an eye out. There might be other, less direct means, to minimize damage from potential combat: releasing pheromones, olfactory distractions, or maybe even geoengineering, massive land alterations that has terrain subconsciously leading kaiju away from city areas, etc. Still mulling that. Point being, these systems are almost purely deterrent, to push kaiju in the opposite direction, as a lot of man-made tech still can't outright kill them; the hope is to basically annoy them in another direction.

In the event a kaiju does push through this defensive line and is intent on getting into a city, there are measures in place there too. I hesitate to say cities are walled; and I don't know that I want to resort to straight-up sci-fi elements, like force fields, as I'm aiming for a certain level of suspension of disbelief; but it's possible there are such walls in place at least some of the time in certain parts of the world. There are also more automated and manned turret defenses, hoping to push the kaiju away at the last minute. There might be more to this layer of defense that just hasn't occurred to me yet.

People in the city must then evacuate certain burroughs/districts/etc. depending on which one is under greatest threat of being attacked. The means of doing so is decidedly less chaotic than in, say, Godzilla movies, where it's basically a churning panic. Almost all buildings feed into underground shelters, far below to accommodate for the immense weight of a kaiju pushing down on the ground overhead, and to just ensure it's not as simple as kaiju digging down to get them; these shelters are sprawling and city-like themselves, so much so that entire communities might just live there year-round.

Almost all buildings are also built with tech that was basically meant to protect against earthquakes but were since implemented for kaiju attacks. Specifically, magnetic systems that are being tested right now to keep taller structures from falling over during rumbling and shaking (I don't pretend to know really how it works, but it's one of many things I'm studying). Poaching an idea I believe I saw from NEON GENESIS EVANGELION, some buildings may straight up recede into the ground, although I don't know how sensible that is.

I'm also toying with the idea that there are defenses in some cities that are deliberately built with facades to look like skyscrapers, maybe as a means of distracting kaiju from other buildings and minimizing damage; once they get close to this fake building, any number of defenses could be activated...maybe it's wired to detonate and fall on a kaiju? Or it's a huge electrical conduit meant to electrocute a kaiju by siphoning all available power from the city into it for a concentrated attack? Maybe the facade falls away and reveals itself to be a tower of turrents? It could be one or all of these things.

It wouldn't be any fun without some sort of tokusatsu type of response, i.e. giant robots or something similar called in to take care of the threat. Once a kaiju is inside a city, it's always the desire of those in kaiju response to push it back out, as killing them rarely happens: so maybe calling a giant robot in to fight them is not the wisest course of action. They are, however, more precise than some military attacks, and definitely preferable to something like biological attacks or dropping a nuke. Their roles are probably almost exclusively meant to grapple a kaiju and get them out of the city; if they're going to fight, they'll do it where casualties are kept to a minimum.

I guess a note: military vehicles are now based on multidirectional technology, for increased mobility and control. Think Harrier tech for jets, or V-tol tech, but way more reliable. The idea being, the military may have retired a lot of the hardware that is only good at getting somewhere really fast but can't stay and fight, like jets that can deliver a payload but then have to bank, turn around, and hope to God they can fire again in time. I admittedly don't know how sensible that is, it's just something that made sense in the planning stages, but I'm not sure if it does in reality.

Also, military vehicles are probably dominantly drone tech. This is to minimize loss of life, as that's considerably more precious now in this alt-reality where the world population is drastically lower than it is right now on our world. So almost all response vehicles are unmanned. There is a human element, like pilots, gunners, troops on the ground, guys inside battle mechs, etc., but it's probably accounting for 10-20% of actual response forces dealing with a situation like this, and that's probably as a last-resort, or specialized tasks.

Similarly, most vehicles in the cities are automated. This is to prevent traffic that will clog up major roadways and keep people from getting to safety. Most shelters can be accessed a more convenient way, but in the event someone is in a car when an attack occurs, all vehicles take their occupants to a shelter entrance, disallowing them to leave until such a time the onboard AI can locate an entrance for them. There might be some ethical backlash to this that I need to think over.

The absolute last thing anyone in power or in charge of kaiju response wants in a kaiju vs. kaiju situation. This is why I hesitate to use defense measures like giant robots inside city limits. If two or more kaiju come into a city at the same time, it's absolutely imperative that they are not allowed to converge on one another. If they do, well, you can imagine.

And, finally, I guess, it's super important that a kaiju is not allowed to simply wander the city: attacks on it do not cease until it is again pushed outside the city limits. That way, on the off-chance it dies, there won't be a 20,000 ton corpse in the middle of a city that you can't move. That, and if the kaiju eventually feels like it isn't worth it to be in the city, it will ideally leave of its own accord, and wander back into the countryside. It's not the most noble sentiment, but then, at that point, it becomes some other city's problem.

So that's all I've come up with at the moment, lest I've forgotten something (I'm sure I have). I guess my question is:

Is what I have sufficient, and/or does it need more?

EDIT: Some notes on the kaiju themselves, I guess...

There are many varieties. Not necessarily species, just different types that aren't easily quantifiable. Mutations, aliens, indigenous creatures to Earth, cyborgs, robots...kaiju is more a catch-all term. They have varying degrees of power, capability, intelligence. Their desires, functions, drives, they're all relatively different. City defenses then have to cover a lot of bases in order to apply to as many hostile types or attacks as possible, as there's no telling what might appear. More specialized defenses have to be formulated on a case-by-case basis.

Their numbers compared to humans are very low. I'm about to indulge in slapdash math, which I hate, but it seems necessary to prove a point: being conservative, let's say this version of Earth only has about 2-4 billion people left; whereas there are only about 20-50 kaiju on Earth, though that number tends to fluctuate with new discoveries and arrivals. Kaiju then are drastically outnumbered, and the chances of being attacked by one aren't all that high. Given the amount of damage they can cause, though, their presence is treated very seriously and most big cities have to have these kinds of defenses in place.

Most do not or cannot reproduce; some are mutants and can't reproduce, some are refugees from other planets or dimensions, cut off from their own kind, etc. Some are long-lived, and have been around for centuries. Some go into hibernative or torpur states, so there can be months or years where they simply don't show up.

A grand majority cannot be killed by human weaponry; more often than not, they die of old age, or from fighting each other. Nuclear warheads can do the trick, but no one wants to use them. Experimental weaponry has its own concerns and baggage. Smaller varieties may eventually die from repeated military response: not all have the same level of strength or defense against our attempts to kill them.

Honestly, I haven't worked out the kinks on how kaiju fit into history yet. History doesn't fork significantly until the recent past, when a kaiju attacked a city and the world at large knew they were real. History has plenty of evidence that they existed before then, but there is a laundry-list of reasons why it wasn't taken seriously till this one dramatic event. Cover-ups, of course, but that's easy and cliche; there's more at work than that. Point being, I haven't gotten that far. It's not terribly important to the topic at the moment.

I will make more edits as necessary.

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    $\begingroup$ Reminder to close-voters:The problem cannot be fixed if the OP it not made aware of it. That being said, I don't see why this has been flagged as unclear what you're asking. The question contains considerable detail, but that is necessary to answer the question of, "Is what I have realistic/sufficient?" $\endgroup$ – Frostfyre Oct 18 '18 at 20:57
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    $\begingroup$ We need more information. Are these kaiju like animals, searching for things like food, or are they nearly-mindless destroyers like in Pacific Rim, or are they intelligent problem-solvers with a goal? Also, what limits their numbers if they can't be killed? Old age? Starvation? If they're aliens, maybe they can only rampage for a few weeks before starving to death or succumbing to the power of our yellow sun? All these elements of your world would help us imagine how prehistoric, and now modern, humans would have fought or avoided them. $\endgroup$ – workerjoe Oct 18 '18 at 21:15
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    $\begingroup$ I'm thinking the VTCers probably can't actually find a question buried in the details! I'd ask the OP to edit for clarity: really excise the unnecessary details & format the query so that it's clear what the single question is, what the background is and what any constraints ought to be. And also focus on one issue. Right now, I'd VTC for being too broad, as "what else might go into systems like this" is by nature too broad a query. $\endgroup$ – elemtilas Oct 18 '18 at 21:31
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    $\begingroup$ Minor thing while reading through this - why are any of the weapons concealed? I realize, rule of cool, but while presumably they'd have cover against the elements, with railguns you're talking line-of-sight targeting. The instant a Kaiju would be able to see one, it would be a target, so spending the time bringing it out of concealment seems wasteful. $\endgroup$ – jdunlop Oct 18 '18 at 22:04
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    $\begingroup$ If there have been kaiju wantonly tearing up the landscape for all of history, then it seems like human culture would develop rather more decentralized, and with a focus on fighting-or-evading the great monsters. Cities might not develop at all -- folks might want some room around them to grow their own food and watch the horizon. $\endgroup$ – user535733 Oct 18 '18 at 22:36
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Modern Munitions Would Rip Kaiju Apart

The thing movies get wrong about modern munitions is that they always show them being deployed at point blank ranges. This makes for great visually stimulating cinematic battles, but the reality is that nowadays even a lot of basic infantry weapons can be fired on targets that are beyond the ability of unaided eyes to see. Air deployed munitions can be dropped or fired from altitudes of 40,000 feet, or fired at targets that are actually over the horizon. The idea that aircraft would be in danger is laughable, they move at a couple times the speed of sound and are several kilometers in the air. A kaiju would have zero hope of ever reaching or catching a military aircraft. These aircraft would respond to kaiju threats with a modified variant of the GBU-57 Massive ordinance Penetrator, pictured here:

enter image description here

This is a penetrating bomb that carries a whopping 30,000 pound warhead. It can penetrate up to 200 feet of steel reinforced concrete before detonating, but can be calibrated to detonate anywhere along that penetration path you might require. There is not a kaiju alive that can hope to survive such a blast occurring inside of it's body cavity. For reference, a 2,000 pound bomb is enough to level a city block, so the GBU-57 being 15 times more powerful will essentially dis-articulate a kaiju in one hit. "But what about super mecha mutant kaiju?" you might ask. What about them, in the amount of time it takes a kaiju to reach a city we can puncture and rupture the beast a thousand times over with complete impunity from 40,000 feet AGL. Bombs are cheap, cities are not. Kaiju defense would more than likely be conducted by a global network of airfields stocked with copious amounts of guided penetrating ordinance like or very similar to the GBU-57.

Preemptive Strikes

It would be pretty difficult to understand why the US military wouldn't simply elect to just hunt down all existent kaiju on the planet and kill them the moment they were detected. If your story is to make sense kaiju are going to need to be continually emerging from some unknown place because I really don't see the people of the world deciding so coexist with kaiju long enough to need a defense system. I think that kaiju would probably be hunted and killed as soon as they were detected, since we already have the tools to do so without risk to personnel as is and letting one just wander around is too big of a hazard. A kaiju wandering around the ocean is the threat equivalent of a nuke with a big red button to detonate it just being left laying around the middle east. Nobody is going to put up with it when a guy in a B-52 strato-fortress can eradicate one with the touch of a button.

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    $\begingroup$ Unless the kaiju can alter the laws of physics, this has to be the answer. $\endgroup$ – Mr.J Oct 19 '18 at 0:08
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    $\begingroup$ Basically any long range weaponary would come handy. IIRC US Navy is practicing with Rail Guns on their ships. $\endgroup$ – Alexander von Wernherr Oct 19 '18 at 8:12
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    $\begingroup$ Heck, if you took a Thales Starstreak with a live motor on the round, but inert filler in the hittiles instead of the HE "booster" that's normally there, a well-placed shot from that would give the Kaiju a heck of a time, at minimum -- we're talking 3x tungsten spikes, weighing in at 2lbs a piece and moving at mach 4 here. (Best part: getting rid of the HE in the hittiles means that it just might be civilian legal to own in the USA at that point -- depends on if the NFA defines "rocket" as a weapons engineer would or as an ordnance tech would...) $\endgroup$ – Shalvenay Oct 20 '18 at 4:09
  • $\begingroup$ "I really don't see the people of the world deciding so coexist with kaiju […] hunted and killed as soon as they were detected" Unless some group(s) amends human rights legislation to include non-humans. Imagine that, the kaiju is not dealt with because anyone murdering it gets the death penalty. Would make for an interesting comedy or a serious "what if?" $\endgroup$ – Loduwijk yesterday
  • $\begingroup$ Movie turn the modern military to a WWI-WWII army but with modern uniforms. A T-34 tank can engage targets at more than 400 meters? We will have our modern tanks walk up to the enemy until they they are withing a spitting distance and fire a single shot then get trampled. Modern automatic rifles range are limited to 10-20 meters and god forbid that a light machine gun exists or you mention infantry fighting vehicles. Zombies are known to be able to penetrate armor, tanks or APCs, on regular bases and can attack air craft carries with ease. As to missiles? Never heard of them. $\endgroup$ – Seallussus 42 mins ago
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I think defenses would depend entirely on why the Kaiju are attacking humans in the first place. If we are simply in the way of their path, then what you have written should be enough to deter them and get people out of the way in time. However if the Kaiju are there to eat you have a problem.

Since you have said that they cannot be killed by human weapons, you have 2 different options. Feed them or Capture them. When feeding them, all you simply do is drop a bunch of food on them. Animals, products, anything to make it full and leave you alone. Since your weapons can't kill it, the Kaiju is just going to keep trying to eat until its full. Think of it like a starving bear and a bee's nest. The bear gets stung, but the hungrier it is, the less it cars about getting stung.

The second way is to essentially trap any attacking Kaiju and leave them to rot. In this case, you drop tons of steel and elastic cables and nets onto the Kaiju. Eventually it gets bogged down or slowed. Then you wrap it up in a ball, ship or fly it away somewhere and bury it under a kilometer of concrete.

Otherwise, you basically have extremely powerful creatures that you can't really stop and no defense is going to help.

As for some of the other ideas:

  • Buildings dropping into the ground doesn't make any sense. Not only do you need to be able to store the entire building in the ground, you need the equipment to get it out of the ground again. Thats a foundation capable of supporting the building and engines required to lift it, as well as a structure that allows it to sit above ground, save from earthquakes, floods, heavy rains, typhoons etc. You might as well build the building underground because that will offer more shelter and be less costly.

  • Multi Directional vehicles aren't always as going to be as good as your standard ones. Multi directional often means more parts and more complicated controls. A Jet fires its missiles and comes around because it is fast vs a land target. Hovering around opens it up to counter fire. It would be wiser to invest in heavier firepower to actually hurt the kaijus rather than control.

  • 20-50 nukes to get rid of all the Kaiju is nothing. Even near populated areas. Nuclear fallout can clear up pretty fast, and with more advance technology, I'm sure they also have more advance bombs. The reward of killing the Kaiju off and only having to manage 1 or 2 is vastly superior to being under constant attack. The government could easily push it as well, because if you wanted to invest in huge walls and machinery they would be taxing the life out of everyone anyway.

  • Concealed weapons are useless. You risk them getting stuck or breaking down easier. The more powerful rounds they fire, the more reinforcing they need. Have a look at the this cannon/artillery https://en.wikipedia.org/wiki/Schwerer_Gustav and the team required to support it.

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    $\begingroup$ The rationale behind hidden turrets, at least in my head, was that kaiju might get wise as to where they are and learn to avoid them. That, and they might deliberately attack them, destroy them, and they'd just have to be rebuilt; so them being hidden, or maybe receding into the ground or something, might prevent stuff like that from happening. That's why I asked this question, though: to have it properly assessed. So thank you. $\endgroup$ – bsideswiped Oct 19 '18 at 14:28
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Any modern society should have no trouble dispatching kaijus.

For the biological reasons:

A comic book about a Kaiju attack. A news anchor is saying: "In today's news a 1,000 meter tall lizard-creature attacked New York City. Given the enormous weight of the creature, and the fact that weight and cross-sectional area don't scale together linearly, the creature was made almost entirely of legs, which were almost entirely made of bone. Additionally, since nerve impulses travel at about 100 meters per second, the creature was not able to rapidly respond to dangerous stimuli. The creature was thus easily dispatched, then used to make a tasty bone broth. Sources say local people reluctantly thanked science for never letting anything interesting happen. We now go live to a lightsaber duel that's no fun because light doesn't work that way."

(Source)

For the mechanical reasons, see this answer.

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