<P> Preservation work for Mohenjo - daro was suspended in December 1996 after funding from the Pakistani government and international organizations stopped . Site conservation work resumed in April 1997, using funds made available by the UNESCO . The 20 - year funding plan provided $10 million to protect the site and standing structures from flooding . In 2011, responsibility for the preservation of the site was transferred to the government of Sindh . </P> <P> Currently the site is threatened by groundwater salinity and improper restoration . Many walls have already collapsed, while others are crumbling from the ground up . In 2012, Pakistani archaeologists warned that, without improved conservation measures, the site could disappear by 2030 . </P> <P> The Mohenjo - daro site was further threatened in January 2014, when Bilawal Bhutto Zardari of the Pakistan People's Party chose the site for Sindh Festival's inauguration ceremony . This would have exposed the site to mechanical operations, including excavation and drilling . Farzand Masih, head of the Department of Archaeology at Punjab University warned that such activity was banned under the Antiquity Act, saying "You cannot even hammer a nail at an archaeological site ." On 31 January 2014, a case was filed in the Sindh High Court to bar the Sindh government from continuing with the event. The festival was held by PPP at the historic site, despite all the protest by both national and international historians and educators . </P>

What was the largest public building in mohenjo daro