Blue Strands in Concrete?

Can anyone figure out what these blue strands are for? The look like rigid plastic tubes, and they’re running through these channels. The whole thing is being encased in a rebar mesh, which makes me think they’re pouring concrete. But why trap these magical blue threads in concrete?

[Update: Pow! Mystery solved. It’s prestressed concrete.]

The mooring for the crane is right there in the middle of it. Have they thought this through?
The mooring for the crane is right there in the middle of it. Have they thought this through?
See how the strands taper out at the end?
See how the strands taper out at the end?

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