Games you remember playing but can't remember the name

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Yay for thread necromancy!

Okay let's see...Some First Person Shooter that I often watched my dad play, when I was like 3 years old. (So it must have been around 1994) It had this really dark labyrinth and I remember you weren't walking through it but rather driving some sort of armed vehicle/hovercraft thingy. I also think some of the enemies were big flying eyes, but I could be confusing that with another game here. Any ideas?