'Sea' in the Bible

it is more profitable to him if a weighty millstone is put round about his neck, and he hath been cast into the sea, than that he may cause one of these little ones to stumble.

and the Lord said, 'If ye had faith as a grain of mustard, ye would have said to this sycamine, Be uprooted, and be planted in the sea, and it would have obeyed you.

And there shall be signs in sun, and moon, and stars, and on the land is distress of nations with perplexity, sea and billow roaring;