The dream of sending humans to Mars is closer than ever before. In fact, many scientists think that the first person to set foot on the Red Planet is alive today. But where should the first explorers visit when they get there? Horizon has gathered the world's leading experts on Mars and asked them: where would they go, if they got the chance - and what would they need to surviv...。Can you keep a secret? I haven't heard anyone for a long time until they arrived. They came for help and they broke the rules. I tried to warn them but it was too late. Little did they know. The party is over. Who will survive?。