Time to put your thinking caps on and have a go at this riddle! First right answer wins a free pardon for the sin of being smug 😉

Oft I must strive with wind and wave, Battle them both when under the sea
I feel out the bottom, a foreign land. In lying still I am strong in the strife;
If I fail in that they are stronger than I, And wrenching me loose, soon put me to rout.
They wish to capture what I must keep. I can master them both if my grip holds out,
If the rocks bring succor and lend support, Strength in the struggle. Ask me my name!