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]