Answer: delved

AnswerCrossword Clue
DELVED

Dug into

DELVED

Probed

DELVED

Investigated, with "into"

DELVED
Did research
DELVED
Probed, with "into"
DELVEDResearched thoroughly
DELVEDDid thorough research
DELVEDScrutinized
DELVEDProbed (into)