When the author states that the ocean is like a patchwork quilt, he is referring to how the ocean is a highly diverse environment. As you already know, a patchwork is an object made up of elements that are completely different from each other, but which are able to harmoniously join together to form the patchwork. The ocean is also like that, as it is formed by several elements that are completely different, but that come together in harmony.
However, the ocean is not infinite, on the contrary, it can have an end, due to pollution and intense human exploitation that degrades the ocean immensely. This is what the author wants to present when he says that the ocean is not limitless.
Answer & Explanation: I have had great many travels by air and land and sea but I have never had one in a train before. This changed when I arrived London for the very first time. I have always had this idea that train journeys are long and stressful. However, they can be very short too, especially if you are on really fast trains like the one I had boarded. It was a train that conveyed me to towards the baggage train area where I was able to pick up my bags. It was an experience I would never forget - one that I am fond of.
