His ancient, dreamless, uninvaded sleep
Huge sponges of millennial growth and height;
From many a wondrous grot and secret cell
Unnumbered and enormous polypi
There hath he lain for ages and will lie
Battening upon huge sea-worms in his sleep,
Until the latter fire shall heat the deep;
In roaring he shall rise and on the surface die.
Which is how I feel when I have to get up early in the morning. (I must do something about the unnumbered and enormous polypi in my bedroom. I'll begin by numbering them).
Incidentally, 20,000 Leagues Under The Sea does not refer to depth. A French league is about four kilometers, so that would be 80,000 km or 50,000 miles. As the earth's diameter is a bit under 8,000 miles, that would mean that Captain Nemo et al would be out the other side and floating around in space. But Jules Verne was not talking about depth, he was still harping on about travelling around the world. The point of the book is that the Nautilus can travel long distances (about twice round the earth) without rising to the surface.
Even more abstrusely (and I promise I'll stop after this), in A Midsummer Night's Dream Oberon sends puck to fetch an ingredient for a love potion and adds:
Fetch me this herb; and be thou here again
Ere the leviathan can swim a league
To which Puck replies:
I'll put a girdle round about the earth
In forty minutes.
This tell us two things. First, as the English league is three miles and Puck understands this to be forty minutes we can calculate the leviathan's top speed as being four and half miles per hours, which is about jogging pace and Not Very Impressive. However, as the circumference of the earth is just under 25,000 miles Puck has a top speed of about 37,000 mph, which is more than forty-nine times the speed of sound.