Describe Kinos dive for the pearl

Kino dives for pearl oysters, where he thinks of the Song of the Pearl That Might Be and the Song of the Undersea. Kino works steadily under the water until he sees a large oyster lying by itself with its shell partly open, revealing what seems to be a massive pearl. Kino forces the oyster loose and holds it tightly against him. When Kino comes up for air, Juana can sense his excitement.