Here's how a $3 billion US attack submarine can run into an underwater mountain, according to a former submariner

The Seawolf-class fast-attack submarine USS Connecticut (SSN 22) at Naval Base Kitsap-Bremerton.
US Navy
A US Navy submarine collided with an underwater mountain last month, the service revealed Monday.
The submarine was a $3 billion Seawolf-class submarine, one of the Navy's most capable subs.
A former submariner talked to Insider about how such an advanced submarine could run into something.
It does not happen often, but submarines sometimes run into things beneath the waves. Last month, a US