Darkness of the deep. Unseen resonances drift/float/hover in nowhere. That echo is a sea-star buried in mud. That other hum is an eel threading through murk.
Deepness of the dark. Obscure sounds linger/pulse/murmur in oblivion. That chord is bioluminous jellyfish and squid, rootless glimmers above worms and ghost crabs. That other reverberation is still and void.
Of this we know nothing.