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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for sandhog

sandhog

/ (ˈsændˌhɒɡ) /

noun

mainly US and Canadian a person who works in underground or underwater construction projects
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012