Ok, we are at the part with all the gas in mission 1...we turned off 2 valves and got past the part where you have to climb on the pipe on the ceiling...but there is still more gas...what do we do now?

Please somebody help us!

If you haven't already figured it out (this post is kinda old), here's your answer.

There should be some pipes on your immediate right after climbing over the gas using the shimmy pole. Walk up to the pipes and your guy should automatically go up against the wall and start walking behind them. Once you get to the exit of the pipes, there will be more gas spraying to prevent you from getting out but if you wait a second, it'll turn off. It turns on and off so once the first guy gets out, the next guy should wait a second for it to turn off again.

Hope that helps.