Monday's Riddle! Into the Deep...

Hello Riddlers! Can you guess the theme this week? Lots of this going on over the weekend ; )  ~ F

Over and under, but really on top. I drift through the crest, though that's what I'll chop. With a bow, I stretch out in wonder, as the wake of my carriage ripples asunder. Bobbing around with my reflection, I stay on course when you right my direction. Should you boldly enter the deep, your body and spirit I promise to keep. 

What am I?

I gave you a clue! 


FEAR NOT THE UNEXPECTED