![](/images/unavailable1000x562.png)
![](https://image.tmdb.org/t/p/w200/y9EZnvmke1YmWjy8bZD0i9bW7Y8.jpg)
A party of tourists -- including a state senator, a park ranger who was her one-time lover, a cantankerous professor, and an escaped convict -- are trapped deep inside the caverns of an unnamed national park, rescued briefly, and then caught in a second cave-in.