1862 26 July 146/2 The tide-waves, whispering evermore To rocks and sands the ocean-lore. Lore of many a mile-deep sea.
1903 R. Kipling in 7 Mar. 8/1 The locusts' mile-deep swarm.
1994 3 July e4/1 Some whoop with surprised delight; others are stunned into silence; and more than a few grasp the protective railing tightly in fear as they gape at the mile-deep drop-off at their feet.