It wasn't Hostile Waters: Antaeus rising, but it was similar in theme, and probably from around that time period ( ~2000)
This was a multiplayer game. You controlled a base, which looked like (from what I remember) some kind of floating pyramid. You could take control of the base directly and fire its guns from a first person perspective. And from this base you could build units like tanks, which you could then take control of.
Sort of sounds like Savage or Savage II...
Minus the tanks..
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