管道水下穿越所通过的水域由于河床的变化而给管道的安全运行带来隐患。
Hidden dangers to safe operation of pipelines will result from changes of riverbed in the waters where pipelines underwater cross.
水下穿越管线采用全断面沟埋敷设于河床稳定层内，确保了穿越管段的安全。
The under water pipelines were laid into the stable bed by ditch burying of full cross-sectional area to ensure the safety of underwater pipelines.
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.
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