Plot:-the plot of the movie is based on the unsung war fought under water between indian and pakistani submarines in 1971 and how the indian submarine S21 survives as well as destroys the pakistani powerful submarine named "ghazi" with the minimal resources.
cast performance:- K.K menon, Rana Dagubbati and Atul kulkarni all had played there part very well but I dont know what Taapsee panuu was doing in the movie, I think the producers thought that its necessary to cast an actress in the movie so just fitted her some how in the movie.
Sound track:- sound track was awesome and has played a very important role in rising the feeling of respect among the audience towards our country and brave soldiers.
cinematography:- here the move looses as cinematography was not done so well to keep everybody engaged while watching the movie, in fact sometimes I also felt bored due to the bad cinematography.
overall the movie is nice and a must watch for every indian.