New Delhi, June 29 -- As floods inundated China's Guangxi area for the second time this week, a heavy-lift drone carried out a dramatic rescue of a man trapped on a collapsing rooftop.

Located at the confluence of three rivers and home to 300,000 residents, heavy rains on Saturday half-submerged the already flood-stricken riverside city of Rongjiang, prompting the evacuation of residents to higher ground.

Rongjiang was inundated earlier this week by record downpours that left six dead and forced more than 80,000 people to flee their homes. The amount of rain that fell over 72 hours was double the city's average for June.

According to media reports, China is deploying highly advanced technological equipment to rescue people from flooded...