What is the narrator trying to convey through the description of the situation in the tenth and eleventh stanza?
In these stanzas, the narrator tries to convey the standstill description of the ocean and the ship. Everything rot because of the motionless sea. Animals from deep within the ocean had come out of their places and crawled in the slimy sea.
At night, the 'death-fires' seemed to dance near them. The narrator refers to the sea water as the witch's oil. Just like a witch's oil has many shades and keeps boiling, the sea water also had 'green, blue and white' colours. However, this was due to the different coloured creatures crawling in the sea.