📜Engineers battled against perilous work conditions, the river's powerful currents, and the inherent difficulties of subaqueous construction. Clifford Holland, the tunnel's chief engineer, whom the tunnel posthumously honors, pioneered the use of a ventilation system that made the enclosed structure viable for carbon monoxide-spewing vehicles. This system became a standard for tunnels worldwide, a testament to the project's pioneering impact on tunnel construction. The tunnel was a hit from the

How Was the Holland Tunnel Constructed?

Holland Tunnel Manhattan Entrance