Yes it was a re-release. I had lost a bet so had to watch this movie alone. Had an unique experience though. This film is so old that they actually shot a tortoise in close up & showed it as a giant creature. But hats off to the creativity & even now I thank my friends for forcing me to watch this. I for one was so pissed off at the film but was amazed that the theater was sold out (it didn't have a balcony) with many families, they kept enjoying the film. That day I realized criticizing a film is useless while you're watching it, there's always atleast one reason you can find to enjoy the worst film too.
And this movie has a 5.6 rating on IMDB, for 1960's standards this was poor man's The Lost World. I have read many positive reviews about this film & back in the day this film was indeed loved. Only now the movie's rating has come down to 5.6 but when I first checked in it was almost 7.