Answer: sandhogs

AnswerCrossword Clue
SANDHOGSTunnel builders
SANDHOGSCaisson workers.
SANDHOGSTunnel workers.
SANDHOGSTunnel builders.
SANDHOGSTunnel workers
sandhogsSANDHOG, a worker who works in sand
sandhogsperson who works, usually in a caisson, in digging underwater tunnels
sandhogslaborer who digs or works in sand