Here are a few more links to documentaries on YouTube. All work as of posting date.
Some lead to more of interest.
Pedro
Nuclear Submarines
[
m.youtube.com]
Three gorges dam
[
m.youtube.com]
Biggest aircraft carrier
[
m.youtube.com]
Teams Siberian Railroad
[
m.youtube.com]
Robots
[
m.youtube.com]
Modern marvels - Earth movers
[
m.youtube.com]
Hydraulics
[
m.youtube.com]