About the Ocean Biome
The ocean biome is - as the name suggests - a large body of water. It has sand on the coastlines. There lies no sea life under the water. You may notice a few islands of the neighbouring biomes scattered close to the coast.
It is strongly discouraged to start a colony as you would have to build your own ground from the shore out to sea. Not to mention the lack of any nearby resources. However, building a colony here would serve as great protection against monsters.