400 years ago, Jubilee Marsh was walled off from the sea and stopped being a saltwater marsh. In the mid-2000s, the Royal Society for the Protection Of Birds bought the land and decided to ‘rewet’ the marsh. Just letting the sea back in wouldn’t be enough though — the land had sunk — but in London, the Crossrail project was excavating the Elizabeth line tunnel and needed a place to put dirt. Cue collaboration, and now a hugely successful bird refuge 
#ShareGoodNewsToo
Oceanographic
Record 40,000 birds flock to 400-year-old revived wetland - Oceanographic
Jubilee Marsh in Essex sees nearly 40,000 wintering birds, a decade after being restored using soil from London’s Elizabeth line excavations.