" It wallowed in its water-bed; it burrowed, heaved and swung;
It gnawed its way ahead with grunts and sighs;
Its bill of fare was rock and sand; the tailings were its dung;
It glared around with fierce electric eyes.
Full fifty buckets crammed its maw;
it bellowed out for more;
It looked like some great monster in the gloom. "

― Robert W. Service , The Collected Verse of Robert Service