Not sure if these are what you're looking for, but:
-
Dr. Becky
[professional commentary on astronomy and astrophysics] -
Anton Petrov
[professional commentary on astronomy and astrophysics] -
What's Going On With Shipping?
[videos about the ins and outs of international maritime shipping] -
Not Just Bikes
[focuses on the many ways urban infrastructure can be improved] -
Sampson Boat Co.
[~seven years worth of videos where Leo rebuilds a 1910 gaff cutter from the keel up. Currently sailing it back to London to participate in race the same boat won a century ago] -
Primitive Technology
[builds cool things with sticks, mud, water and pond scum] -
Bad Obsession Motorsport
[bought an old mini-cooper and shoved an engine from a Celica GT-Four into it] -
Practical Engineering
[a practical look at engineering projects that most people ignore, mostly because they're underground] -
B1M
[videos focusing on large mega projects like tunnels and nuclear reactors] -
Jay and Mark
[map guys that rightfully complain about Londons infrastructure] -
Florian Gadsby
[skilled (practised) potter that makes really satisfying pieces]
There are also channels that are focused on the war in Ukraine and related international shenanigans (in order of avg. video length):
-
Perun
-
Denys Davydov
-
Reporting from Ukraine
-
Suchomimus (poor chap made a channel to nerd out about dinosaurs, then the Russians attacked...)
Also check out ytch.xyz; It serves videos from a curated list of channels such that it behaves like cable television.
Also also check out nebula.tv if you can afford it.