The recent spike in radioactive isotopes had me thinking of this. If someone has a modest amount of money and no regard for safety, it's actually pretty easy to assemble a reactor.

There are a lot of things we think are out of the reach of individuals or small groups of people, but the fact is someone developed many of these technologies in more primitive times without access to modern materials or the internet. We live in an age where morons can make armed drones or cruise missles, or, apparently, counterfeit helicopters.

> If someone has a modest amount of money and no regard for safety, it's actually pretty easy to assemble a reactor.

My understanding is that building a reactor is fairly easy (possibly even in reach of a smart high-school kid). But that getting hold of the enriched uranium required to run a reactor is (thankfully) rather difficult due to trade and production being heavily controlled.

Yeah, a guy from my home high school built a nuclear fusion reactor: https://www.wired.com/2007/03/high-school-stu/

It's pretty cool. It's really cool.

Fusion is one thing. The farnsworth style fusors are relatively easy to make. I'm talking about fission, which is a bit more difficult, but actually could be made possible with the neutrons emitted by a farnsworth reactor(or a bunch of other ways that don't require high voltage/high vacuum).

I've made neither ¯\_(ツ)_/¯

But enriching uranium isn't rocket science. You gassify uranium as uranium hexifluoride, centrifuge it, extract the heavier (uranium-238) fraction, and then turn the uranium-238-enriched gas into solid uranium oxide (recycle the fluorine).

It's not rocket science, and there are other methods available as well. It does take a lot of energy and time though. Probably easier for a low tech setup to just bombard U-238 with thermal neutrons.

Once you get enough U-235, just use beryllium to reflect the neutrons back in and add a moderator(water, graphite, etc). Just don't be anywhere near it when it finally goes critical.

But working with fluorine compounds is seriously dangerous, and the process requires literally hundreds of centrifuges working day and night for months to produce the required amounts of 238

Enriched uranium is hard to acquire but it's not hard to make if you have a source of thermal neutrons. You can get thermal neutrons in a number of ways. I'm not going to get into the details, but establishing criticality is not easy, but it's not hard either, at least if you're not concerned with safety.

A small surprise for me was learning that you can buy a fully functional tank in America for relatively little cash. Where I come from, even the thought of anybody but the army owning a tank is absurd.

The tanks’ guns are disabled. They aren’t functional tanks in regards to the one feature that makes a tank a tank.

It can have another (dual-) use as armored bulldozer. See

[1] https://en.wikipedia.org/wiki/Marvin_Heemeyer

> but the fact is someone developed many of these technologies in more primitive times without access to modern materials or the internet.

With scraps, in a cave!

Stone knives and bear-skins...

The secret is to bang the rocks together, guys!

> quality (?) bootleg stuff

I remember in Hong Kong I'd be offered branded fake watches: a good fake Rolex from the excellent ABC company, not the cheap XYZ ones...

In my country those fakes were always sold as originals. To make this believable, they were sold as stolen.

So you'd be approached on the street by a someone who looked sketchy and offered a Rolex for USD$100. They'd open a bag and let you look into it to see the Rolex while they made a big deal about checking to see that there were no cops around.

If you declined, they'd drop the price by half. Must have been effective because they did it for years.

I wonder what they do if you flash a badge at them.

Great find! Thanks for this. But after reading I wonder how many of these subs can be out there crossing waters of the USA while the whole coast on both sides are monitored full time on irregularities by the US military?

It's a big coast and the monitoring systems may be old and not suitable for detecting mini-subs. Much of the defense of the US was conceived for a completely different type of threat. We expected Soviet nuclear subs, not small battery powered craft that may not even be manned.

I don't suppose it will be long, if it hasn't happened already, before unmanned drones will be delivering most of the illicit cross-border shipments. You could cheaply build a fleet of them and overwhelm most coastal defenses.

That sub was more than 10 years ago... they probably built many since then

Narco Submarines: Covert Shores Recognition Guide

https://www.amazon.com/Narco-Submarines-Covert-Shores-Recogn...