I forgot to include the following sentences. Thank you.

1) So he decides to make himself a hiding place. The narrator examines the material with which the ship was made (has/had been made?) and finds them strange. In particular, he notices that though well armed it is not a war ship. By examining the woods of the ship, he discovers it is built of a material he doesn’t know. The wood is porous and seems to have the features (or looks like?) of Spanish oak.
2) The crew look very old. Their shoulders are bent, their knees tremble and their hair is grey. Furthermore, they seem to have no problem standing.
3) Then he sees the captain face-to-face. He is almost as tall as he is and medium build. He is impressed by his old age. He also notices the captain consulting old charts and obsolete scientific instruments.He goes into the captain’s cabin and takes something to write. He intends to write a message, put it in a bottle and throw it into the sea.
4) After a while the narrator sees big towers of ice on both sides of the ship at a distance. The ice opens up, the ship starts whirling in concentric circles and at last sinks.

1) So he decides to make himself a hiding place. The narrator examines the material with which the ship was made and finds them strange. In particular, he notices that, though well armed, it is not a war ship. By examining the woods of the ship, he discovers it is built of a material he doesn’t know. The wood is porous and seems to have the features of Spanish oak.

2) OK

3) Then he sees the captain face-to-face. The captain is almost as tall as he is and of medium build. He is impressed by the captain's old age and notices the captain is consulting old charts and using obsolete scientific instruments. He goes into the captain’s cabin and takes something to write with. He intends to write a message, put it in a bottle, and throw it into the sea.

4) After a while, the narrator sees big towers of ice on both sides of the ship in the distance. The ice opens up, and the ship starts whirling in concentric circles. At last it sinks.