There is no air hole in sight.
Now, the mother does something remarkable.
She stops swimming.
Here beneath snow and ice, lives an animal that is found nowhere else.
Baikal seals give birth to their pups in hidden dens.
Its mother is away, hunting for food.
The world above is no place for a newborn pup.
The pup is stranded, alone.
Its calls travel across the lake.
Mothers recognize the cries of their young.
