The "dark Internet" is a nice thing, but it is not as secure as one likes to believe:

The weak spot is your connection to your Internet Provider. Your Provider (his computers) know who is online and what a particular client sends and gets from the Internet. And the Providers have to keep logs (required by law in all so called "civilized countries").

All other participants on the Internet (besides your Provider) can not find out what you are seeing and sending on the "dark Internet". But the government has online access to the logs of all Providers (in the jurisdiction of the country). You will find "black boxes" at the site of all Providers (or near them on some crucial connection) belonging to the government which can monitor and read the logs and the active traffic whenever a Judge gives the order.

It might be difficult for the government of one country to have access to a Provider in an other country. But wherever the US has influence, the US government or one of its secret or non secret agencies will have access. Europe is wide open for the US government, also big parts of Asia and South America. You might get away sitting in a rogue state like Kazakhstan or Nigeria, but in these unruly countries money will grant access to your provider. And if you are important for some government the money will be available to buy access in a "wild country".

So, dream on from the "dark Internet". Do not say or do anything on the Internet that should be secret. Behave on the net in the same way you would behave in a public space (e.g. in a public park or in a shopping mall or in a shopping street).

In case you want to write down or digitally store something secret, do not do it on a device that has an Internet connection. No encryption will save you, it is just a question of cost to brake it. Petty crimes or unimportant political antagonism will not lead to your log (at your Provider) to be read, but the moment you really threaten the powers to be, your Provider is wide open and will cooperate with the government (police, secret service, judge).

Greetings, Conrad