Mass Effect - Off you go to the tunnels. Go down the stairs. Near the bottom some Geth attack. Follow the walkway until Shepard comes to an opening. Take it and follow it. To the left should be another opening. Enter and kill the Geth. There should be one of the water valves. Use it.

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Off you go to the tunnels. Go down the stairs. Near the bottom some Geth attack. Follow the walkway until Shepard comes to an opening. Take it and follow it. To the left should be another opening. Enter and kill the Geth. There should be one of the water valves. Use it.