| Soon you come across a blowhole forming a vertical shaft 1.5m in diameter that leads to the surface. |
| The bears wait and watch at the seal's blowhole, not moving, perhaps hiding their black noses behind the ice. |
| The exact method is not clearly understood, but it involves air trapped behind the nasal plug in the blowhole. |
| A calf will hump up onto the back of the sleeping mother, breach onto her, cover her blowhole with his tail. |
| This can probably be attributed to the top blowhole wicking away the rising hot air. |
| When warm air shoots out of the blowhole, it cools as it comes into contact with the outside air. |
