Water is heavy. When you dive, all the water above you presses from every side. Scientists call that force pressure. At the surface, the air already presses with about one atmosphere. Underwater, each deeper layer adds more weight. That is why ears can hurt on a deep swim, and why the deep ocean feels crushing to us. Pressure is one of the biggest challenges of exploring the deep.
⚡ DID YOU KNOW?
Pressure in the ocean pushes from all directions, not only from above. That is why deep divers feel a full-body squeeze.