Holland Tunnel

The Holland Tunnel serves as the first underwater crossing ever built specifically for cars and trucks. Before its completion in nineteen twenty-seven, commuters relied entirely on ferries to transport their vehicles across the Hudson River. The project required groundbreaking engineering to solve a deadly problem, as early planners realized that standard tunnel designs would trap toxic carbon monoxide from exhaust fumes. To survive the trip, passengers needed a solution that would provide a constant flow of fresh air.