ELi5 how is it possible to build such a massive underwater pipe like Nord Stream?

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It’s a huge ass 1200 km long pipe and being as deep as 110 metres and has a diameter of 1.153 m I just can’t comprehend how are humans able to build something like this. Where do they start from to build the pipes how they remove the water and so on I would like a detailed answer like the whole process of building.

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