The late September aerial survey photos taken by Charles Lindbergh showed Gaoyou Lake completely flooding through the dike breaks a full month later. It would take the missionary Harnsberger, engineer Wang Shuxiang and 20,000 workers nearly nine months to seal the major break at Dang Jun Lou. Over 8,000 square miles in North Jiangsu remained inundated in flood water as late as December, 1931, over 3 months later.