Marcus Annaeus Lucanus (Biography) Pharsalia ("Bellum civile") X, 247-50: sunt qui spiramina terris // esse putent magnosque cauae conpagis hiatus. // commeat hac penitus tacitis discursibus unda // frigore ab Arctoo medium reuocata sub axem, (Source) ("Some speak of hollow caverns, breathing holes // Deep in the earth, within whose mighty jaws // Waters in noiseless current underneath // From northern cold to southern climes are drawn"; somewhat excitable 1896 translation by Ridley: 299-300)