An epithet is a byname, a characterizing word or phrase that accompanies or occurs in place of the name of a person or thing. Historically, some have been unfortunate- just ask Alfonso the Slobberer or Eystein Foul-Fart.
The first class of nuclear submarines were a learning experience for the Soviet Navy. The November class boats experienced numerous difficulties and accidents, culminating in what has been described as a potential “Underwater Chernobyl."