On a very basic level this movie has no real story line, no continuity and no common sense. It's stated early on that military groups have been sent in and disappeared - so of course you send in a group of untrained females - at least a couple of whom are emotionally broken. They suspect the "phenomenon" is biological - so of course they don't take hazmat suits, or even breathing filters. Immediately upon entering the Shimmer they wake up in their tents which are placed unreasonably far from each other and state they have lost several days...then nothing else is said or done about that missing time. They are not at all worried about their inability to communicate to the outside. With no idea of the dangers they are facing, THEY SPLIT UP constantly and of course - get into trouble. Even after they're aware of some of the potential dangers - they settle down to sleep in unfortified structures, and set no sentry watches.

All of this set me up to nit pick within the first 30 mins of the film and there were a plethora of nits requiring serious picking. Banal acting, shocking plot holes, too much money spent on CGI and not enough on decent script writing. It's been said before, but the ending of this movie was prime evidence of the screenwriter falling into a coma and I found the entire movie a gigantic yawn fest.