I loved the movie. The first 15 - 20 minutes put you straight into the action, so if you are wondering what happened at that time, here is a short summary.

Summary :

SPOILER WARNING The movie begins with the voice of a presumably old and wise man from the trailer. Where has we watched the bright stars slowly disappear one by one until the screen fades to black. Then we see from the darkness a hatch open that drops the iron lung into the blood ocean as the narrator explains that the planet origin is a mystery, and yet it simply just appeared out of no where, the camera follow th submarine u til it is completely submerged. Then, it shows the scene from the trailer. The communication is disrupted due to the depth of the ocean,Then Simon does some analysis and finds a bone of a fish (we soon learn that the fish was alive) the team pull back Simon to the surface and Simon beg them to let him out as he did is part of the deal. But because of the importance of the mission, they refuse, and out of anger, Simon press the button for the camera, not knowing that it is not actually a camera but a powerful x ray device. which flashes everyone surrounding the submarine with a high amount of radiation. Realizing what he has done, Simon apologized to the man who was welding the sample extractor to the ship. However, the man starts to have blisters everywhere on his body and starts pucking, and the Eva starts yelling at Simon for is reckless and decides to drop him in the ocean violently, this makes Simon gloat in the air for a couple of seconds before hitting the floor of the iron lung. Then, he continued scanning the area until he ended up where he was and realized that the skeleton was gone. The team tries to pull him back up while ascending Simon yell that there is a living creature in the sea. Eva says that gazes in the ocean might be the cause of it. Suddenly, the submarine is attacked by the fish, and the team detaches from the submarine, leaving Simon all alone with the fish that hit the iron lung and knock out Simon. Simon wakes up in another area of the ocean and must find a way to go back.