nature animals · Ages 9-12

The Seal That Dived Where Lungs Should Have Failed

Deep-diving seals slow their heart rate, store oxygen in blood and muscles, and manage pressure so they can hunt far below the surface.

The whole story

1. At first light beneath the Antarctic sea ice, Nori scraped a small groove in the snow beside a breathing hole. Today, he would follow the blue drop beyond the familiar shelf and bring back a fish for the evening meal.

2. Nori lowered his whiskers to the water. A school of silver fish glimmered below the ice, gathering above the blue drop where the seafloor disappeared.

3. Nori filled his lungs at the hole and held one breath. With the ice bright overhead, he entered the blue, leaving the familiar shelf above him.

4. At fifty meters, the water pressed close around Nori’s chest and ears. He tucked his flippers beside his body, and the quick thump inside him settled into a slow, measured beat.

5. The fish were farther down than Nori had expected. He turned his nose toward the pale ceiling, but only for a moment; the deep blue below still held the trail.

6. Nori’s lungs could not remain puffed against the growing pressure, so they folded safely inward. Instead, extra oxygen waited in his blood, and more rested in his muscles.

7. At the mouth of a narrow canyon, the fish hovered in a silver cloud. Nori held still beside the rock, whiskers spread, while the water pressed from every direction.

8. He could climb back toward air, or follow the fish into the canyon. Nori let his heart keep its slow beat and chose the canyon.

9. The canyon opened onto a quiet plain. Nori’s whiskers found the fish before his eyes did, and one clean bite brought dinner within reach.

10. With the fish held gently in his jaws, Nori rested for a breath beside a blue ridge. The pressure had not vanished, but his body was built to manage it deep below the ice.

11. At last, Nori surfaced through the breathing hole with dinner and a long breath for himself. Deep-diving seals slow their heart rate, store oxygen in their blood and muscles, and manage pressure so they can hunt far below the surface.

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