钻 + Directional Complement (进/出/进去)
钻 (zuān) means "to drill," "to bore into," or "to squeeze through" and describes the action of pushing or wriggling through a narrow or tight space. It is often combined with directional complements like 进去 to indicate direction of movement.
小猫钻到沙发底下去了。
xiǎo māo zuān dào shāfā dǐxià qù le.
The kitten crawled under the sofa.
他钻进那个狭窄的山洞里。
tā zuān jìn nà gè xiázhǎi de shāndòng lǐ.
He crawled into that narrow cave.
孩子们喜欢钻到被子里玩。
háizimen xǐhuān zuān dào bèizi lǐ wán.
The children like to crawl under the blankets to play.