How to organize a long WiFi network underground?

Question

WiFi

Dear community, since I myself am not an advanced connoisseur of modern network technologies, so I want to ask for advice.
There is a certain underground object (tunnel, adit, mine, cave) with the appropriate conditions for the propagation of radio waves. The total length of the object is from 200 to 800m. The structure can be extremely heterogeneous. Several power supply cabinets with wired Ethernet are installed inside the facility.
Task: throughout the object to ensure the continuity (with a certain degree of probability) of the connection to the wireless network.
Solution (in the forehead): evenly distribute a certain number of simple WiFi repeaters, then the question is - will the subscribers be in the same network? Will repeaters be able to “transfer” subscribers to each other, as base stations do.
What problems and difficulties might arise in this case? What other solutions could there be? Moreover, solutions should be extremely low-budget (as always).
Or tell me where else to ask.
Thanks in advance!

Answer 1

Start reading from here - habrahabr.ru/post/185138

Answer 2

This is all called an access point
if you buy, for example, the same asus routers (they are familiar to me), then by making the settings on one and saving them to a flash drive, you can transfer them to any of the same (and a matching revision)
there is also a turntable
and in general a wiki to help
https://ru. wikipedia.org/wiki/Repeater
https://ru.wikipedia.org/wiki/Wireless_point_d...
the main problem is in the turns and direction of the antennas (circular and directed), but in general you need to look at the exact model there, like the radius they write,
for example, ASUS RT -N10 and leave one as a router (access point) and all the other turntables
can be found Chinese of course cheaper, but with firmware there may be problems with asus go to the site and update