Now there's a new monster mod making waves and it's leaving players scared to go back into the sea of Subnautica. From exotic Coral Reefs the color of rainbows to the sulfur spewing volcanic clouds of the Lava Zone ( an area perfect for thermal plants), the game really captures that terrifying alien world beneath the waves. The murky blue depths of Subnautica can be both beautiful and utterly frightening at times.