In my Tradition...the Ocean is considered to be the Womb of Mother Earth--from which all Life springs.

I have gone to the Mother's Womb--during every traumatic stage of my journey through this life. She enfolds me and washes all my cares away--strengthens and prepares me to stand and fight another day!

The Ocean holds the most Powerful Cleansing Magic that exists on Mother Earth (IMHO).

She is (likewise) considered to represent the Cauldron of Life, Death, and Rebirth--She washes away the old energy--so that fresh, new, energy can take root and grow.