Answer: sandhog

AnswerCrossword Clue
SANDHOGSubway excavator
SANDHOGTunnel digger
SANDHOGUnderwater-tunnel digger
SANDHOGHe works under rivers.
SANDHOGTunnel worker.
SANDHOGTunnel digger.
SANDHOGTunnel worker: Slang.
SANDHOGTunnel worker
sandhoglaborer who digs or works in sand
sandhoga worker who works in sand
sandhogperson who works, usually in a caisson, in digging underwater tunnels
sandhoga laborer who works in a caisson in driving underwater tunnels