With a capacity of 250.000T/m, the SGC-250 continues to be the largest land-based crane in the world

https://interestingengineering.com/ie-originals/giant-machines/season-2/ep-8-with-a-capacity-of-250000t-m-the-sgc-250-continues-to-be-the-largest-land-based-crane-in-the-world

What is it lifting?

Seems to be a component of a nuclear power station

https://www.sarens.com/about/news/world-s-largest-crane-achieves-first-major-lift-at-uk-s-hinkley-point-c-power-station.htm