Terror on the Moon

You are an American astronaut on a secret mission to the other side of the moon. You are accompanied by 4 other astronauts. You know that a Russian-Chinese mission is nearby, and both have tried to spy on each other, spying on their encrypted communications. After several days, the other team stops trying to communicate. They don't send any more signals. John Walker and Peter Stew go out to explore to try to see what happened to the Soviets. Only John Walker returns. He is scared. He says that Peter disappeared and that they should return to Earth urgently.