How Some Animals Hold Their Breath for Over an Hour Underwater

For most people, holding their breath for more than a minute is a challenge. Yet some animals can remain underwater for over an hour without taking another breath. Their secret is not unusually large lungs alone, but a remarkable biological adaptation hidden inside their muscles. These animals produce exceptionally high levels of a protein called myoglobin, which stores oxygen and releases it gradually when needed. This allows them to keep swimming, hunting and diving long after the oxygen in their lungs has been used. It is one of the most impressive survival strategies in the natural world and continues to inspire scientific research into human health and endurance.