Holland Tunnel 1927: The Sandhogs Buried in Concrete

They Built a Tunnel Under the Hudson. Two Engineers Died. The Workers Were Erased.

America’s First Underwater Tunnel: The Project That Changed Everything

How the Men Who Dug the Holland Tunnel Worked in Compressed Air Until Their Bodies Gave Out

Clifford Holland - appearance

"The Engineer Who Died Building the Impossible"

Cavalcade of America 410728 237 Clifford Holland, Old Time Radio