Swimming

I was just taking a swim
I know I've been gone for awhile
But I'm back now
I took an adventure
It was dark, cold, and wasn't a pretty picture
I saw things that left me scarred
And I've resurfaced
So you don't have to worry about me
I'm back now
And I won't be leaving
I know you thought I must've sunk to the bottom
And quit breathing
But I was merely swimming