Xibalba

Not much action. Not much horror. Not much suspense. Some interesting locations, but the movie is slow, the plot weak, characters shallow. Minimal background and history. An hour in, little had happened. As another reviewer mentioned, they're supposed to be top expert divers. They don't use rebreathers. I was uncomfortable listening to them jabber in underwater caves when one would be conserving air. It should have been silent with captivating underwater footage. The dialogue foreshadows what's to come. I wanted to be drawn in more than I was. I ended up just wondering if I wanted to see the end or not. All the suspense was in the last 20 minutes. Super cheesy. It got so ridiculous at the end, I couldn't take it. Just another greedy white man with no respect for the culture of others. Skip this and watch The Abyss!

Subtitles, bad dialogue, slooooooow until the monsters finally show up and then, it doesn't get much better.

This wasn't even enjoyable as bad sci-fi.

It's definitely a SyFy Channel wannabe, but actually with a far better plot and cinematography. The biggest con is it takes forever to truly get to the action with the "aliens". While the build up is decent it lacks energy. The direction and story building is there but the actors for the most part seem to just go through the actions. The fact that the build up takes so long and you invest in watching for a payoff the payoff comes slate and leaves the movie open as if this were a pilot or the beginning of a series of movies and with the premise used. Sadly, because of that the ending was empty as a standalone.

The 2 cave divers you see diving in the real cave were diving with 2 side mount cylinders as well as a smaller cylinder (deco or bailout bottle) and were wearing normal scuba masks, one with helmet with 2 lights on the side (typical cave gear). Yet when you see ALL the divers come up, they are wearing full face masks, only have a single centre back mount tank. They also talk about being low on O2 (not air) and earlier discussed oxygen percentages they had left. It should have been how many PSI or Bar they had left. I'm sure they just took some stock footage of cave divers and put the rest in, but even non divers can tell the difference in gear.

Low budget is not a curse untill it meets low scriptwriting, confusing shooting and editing, hilarious dialogues, sound probably recorded on Nokia 3310 and... well THAT acting. Actually this movie is quiet a masterpiece. You can show it to a film school students as an example how do NOT make movies.