As a drama about a submarine and the attempts to rescue its crew, it is a so-so movie. However, by saying that it is based on true events, it is an insult to the memory of those the movie claims to be depicting because a significant part of the movie is fiction. If you are really interested in learning about the Kursk and the events of August 2000, read the book that the movie says it is based on ("A Time to Die") and/or watch a documentary. The truth is far more interesting than this fiction.