This is well produced adventure movie with realistic effects and a gripping story. The movie is about about a record breaking baloon flight to a height of 35000 feet. One wonders whether this is based on true story. There are some scientific flaws though, like which has are they using in the baloon ? In the last scenes the gas ejects out with a hiss. Since only hydrogen gas was available in those days, it would have easily caught fire under those conditions.
All in all the movie is worth watching.