Keep your head above water

beɪəθɹiː ts.hi.ɜ taʊtuː neɪəθɹiː kɪŋwɒn zɪŋθɹiː baθɹiːətʃɪtuː tətuːənɐθɹiːəʊ kɪwɒŋŋksɪθɹiːŋ

In Chinese 保持头脑清醒 (Bǎochí tóunǎo qīngxǐng)

This idiom is used to describe staying afloat in a difficult situation.