The sinking of China's new nuclear submarine would be a significant setback for its navy for several reasons:

 

Loss of Resources: Nuclear submarines are highly sophisticated and expensive assets. The loss of a new nuclear submarine represents a major financial loss for China.

Technological Setback: The sinking of a new nuclear submarine would mean a loss of cutting-edge technology and valuable research and development efforts.

Operational Capability: A nuclear submarine significantly enhances a navy's strategic and operational capabilities. Losing one would reduce China's ability to project power and conduct operations effectively.

National Security Concerns: The sinking of a nuclear submarine raises concerns about the security of China's military assets and could potentially expose vulnerabilities in its naval operations.

International Reputation: Such an incident could damage China's reputation on the global stage, particularly in terms of its military capabilities and reliability.

Overall, the sinking of a new nuclear submarine would be a significant blow to China's navy, impacting its resources, technological advancement, operational capabilities, national security, and international standing