After the bridge where Foe Hammer is shot down, keep to the right side of the tunnel. You will eventually see a small passage in the side of the wall. Go through the passage and about halfway down, you will see another passage to your right. At the end of this passage will be the Thirsty Grunt. Upon approaching, he will say:
- The description for the Grunt water bottle in the Bungie store mentions a "grunty thirst."
- If you pick up the Grunt's Plasma Pistol and fire a charged shot, the green orb of energy will not appear; only the sparks do.
- The Thirsty Grunt will only spawn if the player enters the passage through the first entrance as described above. If the player goes through the second entrance instead, he will not spawn.
- The Thirsty Grunt is the only SpecOps Grunt in Halo: Combat Evolved who carries a Plasma Pistol. All others in the game carry Needlers or Fuel Rod Guns.