For the majority of Earth’s creatures, life really is “better down where it’s wetter, under the sea.” Scientists estimate that as much as 80% of life on Earth is found in its oceans. With as much knowledge as we have gained about the oceans, we have truly only scratched the surface.

Here are five underwater photos from our Picture This: Your Great Outdoors photo contest. See the most recent and past contest winners and sign up for alerts when the next contest is announced on our website.