Some whales, they say, will keep under for an hour.

But while he is under, mind, the air in his lungs is getting foul, and full of carbonic acid, just as it would in your lungs, if you held your breath.

So he is forced to come up at last: and then out of his blowers, which are on the top of his head, he blasts out all the foul breath, and with it the water which has got into his mouth, in a cloud of spray.

Then he sucks in fresh air, as much as he wants, and dives again, as you saw him do just now.
And what does he do under water?
Look--and you will see.

Look at those birds.