Rescue operations have been hampered by difficult terrain and extensive debris, with several flood-hit areas cut off from aid and emergency teams struggling to reach those stranded. Meanwhile, China has warned of continued rainfall in the disaster-hit region, raising concerns that rising water levels in a barrier lake could trigger further flooding.

At least 933 workers are believed to be trapped at around half a dozen hydropower projects in Nepal following last week’s devastating floods, the country’s disaster management authority said on Monday.

Here are five key points on the developing situation:

• Trishuli-3A rescue effort: Nepal is intensifying efforts to reach hundreds trapped inside tunnels at hydropower sites, including Trishuli-3A, following Wednesday’s flash floods.
• No contact yet with those trapped: Rescue teams, including experts from China and India, have attempted to make contact with people inside the tunnel but have so far gotten no response.
• Hydropower workers among the missing: Officials say hundreds of the roughly 2,500 people still unaccounted for are believed to be employees of Nepal’s hydropower projects.
• Nepal’s death toll climbs: At least 794 people have been confirmed dead in Nepal, with more than 2,500 still reported missing, according to local officials.
• Cross-border impact in Tibet:  Chinese state media reports 16 confirmed deaths and 546 people missing in Tibet, with rescuers struggling to find survivors.