The concept of crawling through tight, winding, unfamiliar tunnels is scary enough. But, of course, this movie moves far beyond that.

This movie has a great setup with a close group of long time friends having fun and reuniting for different outdoor adventures.

From the beginning the directing is great. You really get a sense of adventure and the anxiety/excitement that goes into exploring a cave. It portrays it well and brings home the endeavor that cave exploration is.

The story is engaging as it builds. They run into natural trouble that's bad enough. But then the dire situation becomes far worse.

This movie is genuinely suspenseful. The gore is well done. The characters are sympathetic. The emotion builds to a fever pitch.

There are some shocking elements to the ending.

It is a great movie and there is no way it should be rated anything less than an 8 out of 10.

It really is well done. With relatable characters you can actually care about. It's considered a classic by many for a reason. It's legitimately uncomfortable, suspenseful and scary. And well directed. It's just a great movie.