Saw it in approx. 2005. On DVD. In color. Probably from the 1990s or early 2000s
SciFi extraterrestrial life form movie that takes place mostly in an underground facility where they either created or discover the life form. A team gets sent in to figure out what is going wrong down there and the life form has killed a lot of people. The life form looks like blue ooze sometimes, but can shape shift and possess people. In the end they realize they have to completely destroy the facility or else humanity will be screwed. The two main characters (a couple I think) escape and the place is nuked. The ending was very weird because they saw a doctor and he said some questionable things to them. Also, I think the last scene was of some blue ooze coming out of the destroyed facility into a stream of water.
I believe the movie is not well known because I’ve been wondering about the title of it for a while and have not seen anything resembling this plot on the internet anywhere.