Initiated at 8:00 a.m., the operation lasted well into the night and was only considered completed when the crane and its loads had returned to the Assembly Hall and were secured. By then Saturday had turned into Sunday, but 31 March—the official target for ITER Council milestone #50*—was still 48 hours away.
The crane and its loads moved slowly, taking long pauses at strategic locations: at the "seismic link" between the two buildings, at the threshold of the Tokamak Building, over the protruding lid of the Assembly Pit ...
All the while, metrology systems were monitoring the deflections that the loads were causing to the runway beams and steel pillars—essential information for validating the crane hall's structure and achieving the milestone.
With the temporary wall between the Assembly Hall and Tokamak Building removed, one could take in, for the first time, the full theatre of future assembly operations—a huge open space that even dwarfs the 20-metre-high vacuum vessel sector sub-assembly tools.
It was an awesome view that conveyed the unique size, complexity and beauty of ITER.
* Since early 2016, the ITER Organization has been tracking project progress against high-level milestones agreed by the ITER Council. Whether related to construction, manufacturing or deliveries—or rather to programmatic milestones like recruitment and contract signatures—these milestones are underpinned in the schedule by the many thousands of activities that make up progress to First Plasma.