The Russian spy ship patrolling the East Coast was located near a U.S. submarine base in Connecticut Wednesday, CBS News national security correspondent David Martin reports.

The ship, known as an AGI (Auxiliary, General Intelligence), was located 30 miles from Groton, Connecticut, Martin reports.

Groton is the home of Naval Submarine Base New London, which the Navy describes as the "Home of the Submarine Force."

According to the base's website, 6,500 military personnel are stationed there and 1,000 civilian employees work there.

The ship had made a port call in Cuba and has been working its way up the East Coast. It's expected to turn around and head south toward Cuba.