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If you were cutting large enough holes for socket back boxes and wiring some connecting sockets, you would have enough room to use a small mirror to help fishing the cables through. There's a chance that the holes are lined up despite the blocks usually being offset and with a fair amount of overspill.
Electricians usually use a rod set/fish tape with a variety of attachments to help in this type of scenario.
The internal walls in my apartment are made out of something like this:
And I want to wall-mount my TV on one of those walls.
What are the chances I can just cut a couple of holes (one above the other), and just push the cables through the holes in the blocks?
In the tutorials I've found on youtube they are always mounting TVs on drywall with nice big cavities to run cables.