There is an underwater obstacle section. Participants have to hold their breath and make their way through the muddy, freezing water.

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。

youdao

Thee Olympic Games competitions prior to FINA had included a variety of unusual events such as underwater swimming (1900), 200m obstacle swimming (1900) and plunge for distance (1904).

在国际泳联成立以前，奥运会游泳比赛曾包括一些非常规项目，如1900年奥运会上的潜泳、200米障碍泳以及1904年奥运会上的水上跳远等。

youdao

The Olympic Games competitions prior to FINA had included a variety of unusual events such as underwater swimming (1900), 200m obstacle swimming (1900) and plunge for distance (1904).

在国际泳联成立之前，奥运会游泳比赛曾包含一些非惯例项目， chaussure pas che，如1900年奥运会上的潜泳、200米阻碍泳和1904年奥运会上的水上跳近等。

youdao

The house had grown disturbed doors pestering at their frames whenever the weather drew breath, clatters on the roof, something twisting, searching overhead, and meanwhile she dreamed a little of being underwater, swimming the length of an obstacle course, both a game and an obstacle course, in some kind of terrible amusement park.

NEWYORKER: Wasps