Mega crane needed for mega job
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Mega crane slots in final bit of mega underwater tunnel

3 May 2017 Last updated at 11:09 BST

Engineers have been doing the tricky job of slotting in the last section of a huge undersea tunnel in south-east Asia.

It's part of a mega bridge called the Hong Kong-Zhuhai-Macao Bridge, which will connect three different places on the coast.

They used the world's heaviest crane ship to hoist the 6,000-tonne piece of concrete into place.

Jenny has all the details.