The waters compassed me about, even to the soul: the depth closed me round about, the weeds were wrapped about my head. The waters compassed me about even to the soul - So as to seem to deprive me of life. I had no hope left.
The weeds were wrapped about my head - This may be understood literally also. He found himself in the fish's stomach, together with sea weeds, and such like marine substances, which the fish had taken for its aliment.