Altitude is definitely an underrated film. It seems that a lot of people disliked it's time-travel, different dimension and supernatural themes as the first half seems like a normal realistic thriller. I actually really liked it, and I'll definitely watch it again. It's about a group of friends (one of which can fly a plane) decide to use a small plain to get to a concert in another country. Whilst in the air they discover some problems with the plain, get lost in a seemingly endless patch of fog and start fighting and arguing. The plane begins to fly downwards due to technical problems and they soon discover there is no ground...they seem to be in some sort of weird foggy dimension with no sign of land or escape from the fog. Then (as you can see from the cover) a giant tentacle monster starts to attack them. Not much is explained about the monster. You briefly see it's face at one point but you never really see how big it is or if it's flying or attached to the ground. There's some cool time travel and supernatural power twists which are significant to the film but I won't go into them to avoid spoiling the film. There's little gore but it could be found scary, depending on what sort of things scare you. It's very tense are has a dark feel to it.
The only things I didn't like were that one or two of the characters were a bit stereotypical and the main character was being pointlessly mean to her boyfriend. Also I was a bit disappointed by the ending, I thought it was a bit cheesy, unlike the rest of the film. Don't get me wrong, it was a good ending, but I can think of many ways it could have been improved. After the film ended I kept thinking about for the next day or two, and it still crosses my mind occasionally now due to the fact that so much is left unanswered and left to your own interpretation and ideas, which I think is really good. I don't think a sequel is necessary, but maybe a semi-sequel would be good? Like completely different story with different characters but maybe about the same monster or fog dimension that could explain more about the alternate world they were in or maybe about a relative to the boy which would explain more about him (you'll understand what I mean after watching the film). So overall, Altitude is a very unique and special film, that is not for everyone, but if you enjoy supernatural twists, giant monsters or weird crazy films then this is for you! 8/10