“A bottomless pit”in other languages

Same idea, different pictures

English and Polish dig a hole with no bottom: a pit, or a well, studnia bez dna. Whatever you pour in is simply gone.

French reaches for Greek myth. The Danaids, daughters of King Danaus, killed their husbands on their wedding night and were sentenced in the underworld to fill a barrel full of holes, forever. Le tonneau des Danaïdes is any task that eats everything and is never finished.