[Scuba]

"I shot an arrow into the air,
It fell to earth, I knew not where;
For so swiftly it flew, the sight
Could not follow it in its flight.


I breathed a song into the air,
It fell to earth, I knew not where;
For, who has sight so keen and strong
That it can follow the flight of song?


Long, long afterward, in an oak
I found the arrow, still unbroke;
And the song, from beginning to end,
I found again in the heart of a friend."
-- Henry Wadsworth Longfellow