sandhog

or sand hog

[ sand-hog, -hawg ]
/ ˈsændˌhɒg, -ˌhɔg /

noun

a laborer who digs or works in sand.
a person who works, usually in a caisson, in digging underwater tunnels.

Origin of sandhog

An Americanism dating back to 1900–05; sand + hog

British Dictionary definitions for sandhog

sandhog
/ (ˈsændˌhɒɡ) /

noun

mainly US and Canadian a person who works in underground or underwater construction projects