Answer: burrowed

AnswerCrossword Clue
BURROWEDWent underground
burrowedMove underneath or press close to something in order to hide oneself or in search of comfort
burrowedMake a thorough inquiry; investigate
burrowed(of an animal) Make a hole or tunnel, esp. to use as a dwelling
burrowedMove (something) in this way
burrowedBURROW, to dig a hole of tunnel in the ground
burrowedAdvance into or through something solid by digging or making a hole