The world's biggest nuclear fusion project has entered its five-year assembly phase.
After this is finished, the facility will be able to start generating the super-hot "plasma" required for fusion power.
The £18.2bn (€20bn; $23.5bn) facility has been under construction in Saint-Paul-lez-Durance, southern France.
Advocates say fusion could be a source of clean, unlimited power that would help tackle the climate crisis.
Iter is a collaboration between China, the European Union, India, Japan, South Korea, Russia and the US. All members share in the cost of construction.
Current nuclear energy relies on fission, where a heavy chemical element is split to produce lighter ones.
Nuclear fusion, on the other hand, works by combining two light elements to make a heavier one.
https://www.bbc.co.uk/news/amp/science-environment-53573294