About 10 years ago I saw a movie which I can't find any information about. I have lost the name of the title so I will try to explain what it's all about.
There was most likely a woman in a team that was going to explore an unknown structure that looked like a black mountain that was smaller on the bottom than on the top. In some way it can be described as a non symmetrical pyramid that was upside down. I have memories of the team exploring the structure from the inside and it reminded me a lot of the new movie Arrival.
Anyone has any idea of what this movie is called?