What were the challenges in Himalayan Tunneling?

Question

Accepted Answer

Himalayan tunneling faced challenges like difficult terrain, high altitude, and geological instability.

Difficult terrain made it hard to access the tunneling site.
High altitude caused problems like altitude sickness and lack of oxygen.
Geological instability led to frequent rockfalls and landslides.
The presence of fault zones and water ingress also posed challenges.
Construction of access roads and transportation of equipment were also difficult.
The need to maintain environmental sustainability added to the challenges.