Underwater Secrets

"Come seek us where our voices sound,
We cannot sing above the ground,
And while you're searching, ponder this:
We've taken what you'll sorely miss,
An hour long you'll have to look,
And to recover what we took.
But past an hour - the prospect's black
Too late, it's gone, it won't come back."
- - [[Harry Potter and the Goblet of Fire]]