这里进行的是水下障碍物项目，挑战者必须屏住呼吸穿越冰冷的泥潭。
There is an underwater obstacle section. Participants have to hold their breath and make their way through the muddy, freezing water.
M3项目的关键部分还将包括基本的低级智能、最佳路线选择和避开障碍物等。
Basic low-level intelligence, the type needed to choose the best travel routes and avoid obstacles, are also key parts of the M3 program.
接下来的挑战项目要在空中举行，挑战者须要通过绳索来跨越障碍物。悬挂在比赛场地的标语牌——“记住，你已签署了死亡协议”，警告了这个项目的危险性。
The next section takes them high into the air, traversing the obstacles using ropes.The sign in the foreground is a stark warning of the dangers.
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