For years, critics insisted a bridge here was an impossible dream. The challenges were immense: brutal winds, treacherous currents, and the nearby San Andreas Fault. Yet, chief engineer Joseph Strauss was determined. Construction officially began on January fifth, 1933, right in the heart of the Great Depression. The scale of the task was staggering. To support the weight, workers spun two massive main cables. Each cable measures 3 feet in diameter and is made of twenty-seven thousand, five hundred seventy-two individual strands of galvanized steel wire. If you were to unspool all that wire and lay it end to end, it would stretch for 80,000 miles—enough to circle the Earth more than three times. Despite the technical hurdles and a 35 million dollar budget, the bridge was actually finished ahead of schedule and under budget.