Can you guys name this old retro game?

Well what i remembered is that it is a 3D fps, you are inside your ship. the stage is like you are inside a space station/base where there are hostages. you save them for what ever reason. There are 3 kinds of Keys Green for lvl 1 Blue lvl 2 and Red for Boss area and Exit. (not sure i think there was a yellow key) dunno the name of the game but it was old. the interface was similar to what Elite looks like but less complicated.