Maynard's interpretation of Ænema, which is funnily enough, his own song:

"It's certainly a metaphor for change...on several levels. It's about actual physical changes in the earth which will result in spiritual growth, depending how you look at it. You can choose to see it as an apocalyptic scenario, or look at it like global awareness and realize changes in the earth are inevitable. The refrain of the song is kind of a joke. 'Learn to swim' is rather than just 'shit's hitting the fan, better learn how to swim,' but it can also be looked at as involving the whole collective environment and how all of us as individuals need to learn how to go into the deep dark waters."

courtesy of Maynard James Keenan himself and toolshed.down.net