וְאֵ֨ת בְּקִיעֵ֧י עִיר־דָּוִ֛ד רְאִיתֶ֖ם כִּי־רָ֑בּוּ וַֽתְּקַבְּצ֔וּ אֶת־מֵ֥י הַבְּרֵכָ֖ה הַתַּחְתּוֹנָֽה׃
And ye saw the breaches of the city of David, that they were many; and ye gathered together the waters of the lower pool.
Read kabbalistic (mystical) interpretation of Isaiah 22:9: and classical mystical sources.