Photos from top of dampublished at 09:13 British Summer Time 6 August 2019
Nick Smith
BBC News Online
The BBC Panorama team has been given access to the top of Toddbrook Reservoir.
These photos show up-close the aggregate, structural foam and concrete that has been used to plug the hole.
You can also see a construction worker putting foam under the concrete. This is a temporary fix to stabilise the dam until full repairs can be carried out.