so 'śayiṣṭābdhi-salile
āṇḍakośo nirātmakaḥ
sāgraṁ vai varṣa-sāhasram
anvavātsīt tam īśvaraḥ
saḥ - it; aśayiṣṭa - lay; abdhi-salile - on the waters of the Causal Ocean; āṇḍa-kośaḥ - egg; nirātmakaḥ - in an unconscious state; sāgram - a little more than; vai - in fact; varṣa-sāhasram - a thousand years; anvavātsīt - became situated; tam - in the egg; īśvaraḥ - the Lord.
From this verse it appears that all the universes are floating in the Causal Ocean.