When they reached the throat of the monster, they stopped for a while to wait for the right moment in which to make their escape.
I want you to know that the Shark, being very old and suffering from asthma and heart trouble, was obliged to sleep with his mouth open.
Because of this, Pinocchio was able to catch a glimpse of the sky filled with stars, as he looked up through the open jaws of his new home.
"The time has come for us to escape," he whispered, turning to his father.

"The Shark is fast asleep.

The sea is calm and the night is as bright as day.

Follow me closely, dear Father, and we shall soon be saved." No sooner said than done.

They climbed up the throat of the monster till they came to that immense open mouth.