I have done some design and construction for what I used to think were large turbines in Pipeline Gas Compression...
About 1/10th the size of these.
I kinda envy you then...I would have liked to work on these when I retired from the USAF.
I always wondered what these guys looked like...didn’t think they would be that different from a jet engine...
Probably operate on the same principles with one notable exception...GO.