I was hearing the song Augen unter Null by Eisbrecher:
Augen unter null –
Sehen das Ufer nicht,
Und kein Land in Sicht.
I think Augen unter Null is a kind of idiomatic expression. Can you explain the meaning of it?
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This is not an idiomatic expression. "null" refers here to the sea level, which is (not very frequently) referred as "Normal-Null" in German.
Often "unter null" means temperatures under 0°C, but this wouldn't make sense here.