"The Hum"

You guys are way off base, lol; that is the sound of the Earth wearing out. The old rotator bearings are rumbling along. The star engines are tired of pushing, pushing, pushing, all the time pushing. The tide engine has been pumping what seems like forever, and the locust men are jostling in the shaft of the abyss.
I hear it too especially in the evenings as I prepare for sleep, cuz with everything else shut off, my ears are roving for sounds to identify.
I put earplugs in but then I hear my heartbeat;
ka-chunk, ka-chunk, ka-chunk,
60-59-58 ..............
zzzzzzzzzzzzzzzzz........................