Minecraft wiki entry for Ocean, associated text: Survival in ocean biomes themselves is impractical due to all the water. A player who camps on an island in the ocean faces a rather difficult situation. Ocean biomes are quite vast; one might not find the mainland for hundreds or even thousands of blocks. This means that whatever resources found on an island might be all the player has if the player is unwilling or unable to venture out. See the island survival article for more information.