Basically what you want to do is have one or two aquanots with really high scores from the M.C. labs armed with mc disruptors. They dont even have to leave the sub. Then have the others go around to look for aliens. When you find one, use the M.C. disruptor on them and you have an extra guy for the turn. You can have them search rooms and kill other aliens for you. just make sure you follow them so they dont leave your site and you can use this tip over and over and over again.It's nice to see aliens kill each other