US Nuclear sub has hit an unknown object in the South China sea

[Trim Stab]

Originally Posted by Right20deg

This is of concern. I would have imagined that on board tech would detect and avoid such collision. More information required.

They would not be using sonar. It is a nuclear boat on patrol - they just navigate using onboard IMU and charts. A collision with an uncharted object is always a risk - look up USS San Fransisco incident.