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I think this is work taking place on the cooling plant on the back side of the park:
Source: https://www.linkedin.com/posts/mhamad-schinder_yasisland-civilengineer-activity-6932243681399685120-VrQb/
SeaWorld Abu Dhabi has been added to another version of the Yas Island map:
Source: https://www.grandprixgrandtours.com/wp-content/uploads/2021/12/F1-Map-2021-V4-compressed.pdf