Work to build a new leisure centre at Elephant and Castle has been delayed by three months following the discovery of a medieval burial site.
Some 500 skeletons were found at the site, which is part of the area’s £1.5 billion regeneration programme, the BBC said.
It said that although the area was known to be home to a graveyard, archaeologists had been surprised by the extent and nature of the arrangements they found.
Southwark Council leader Peter John said construction would start once the burial site had been “sensitively dealt with".
Work on the leisure centre, which will include a 25m swimming pool, is now expected to begin in February.
"We've already surpassed one degree of global warming," said Kristen Buida, manager of the London Climate Change Partnership.