Good flick but why the crawlers?

Rating: 7/10 (25 March 2018)

For the most part I enjoyed this movie. The table was set at the beginning with two friends, a probable affair, tragic accident and an opportunity to re-visit/resolve issues while on a cave spelunking adventure with friends. I felt within the first few minutes of the movie that the direction, script and characters were well developed and could lead to a great movie. The tension between the two main characters was great and pretty well acted. The cave scenes were also excellent for generating a wonderful sense of isolation and foreboding.
The problem I had with the film was that it was really two movies in one with the director unable to decide which way to go. The conflict could have played out well in so many different ways without so many other characters involved. I also felt the crawlers were overplayed and maybe even unnecessary except for creating ambiguity surrounding Sarah's actions at the end toward Juno. Was it revenge, or an act of survival?
As it is I suppose it's a (decent) horror flick because of the creatures and blood, but it could have been an amazing adventure/thriller without.