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Mass Effect Hints
Find Water Valves
1 of 3: The water valves are down in the tunnels area, which you'll be exploring on the "Feros: Geth in the Tunnels" assignment.
2 of 3: Do that assignment up to the point where you find two of the water valves (just before/to the south of the four-way path split).
3 of 3: Opening the first one of those will move you on to the "Find More Valves" objective.