^ Construction costs are immensely over inflated. The actual cost of materials and labor is well within the number given (and likely even less). The estimate you gave is considering other factors. Use 20,000+ workers from around the world and have nonstop construction (aside from extenuating circumstances, weather, subzero winter months) and the cost would fall within and well below the estimate given. The number given is very accurate and here is why:
Bering Strait Crossing
Length: 43 miles
Cost: $20 Billion
Danyang–Kunshan Grand Bridge
Length: 103 miles
Cost: $8.5 Billion
Gotthard Base Tunnel
Length: 95 miles
Cost: $12 Billion
Changhua–Kaohsiung Viaduct
Length: 98 miles
Cost: $8.5 Billion
Lærdal Tunnel
Length: 16 miles
Cost: $113 MILLION
Channel Tunnel
Length: 24 miles
Cost: $14 Billion
Bohai Strait-Crossing Tunnel
Length: 76 miles
Cost: $40 Billion
China-Taiwan Tunnel
Length: 84 miles
Cost: $80 Billion (but China-Taiwan tunnel is 1000 feet deep versus the Bering which is only 100 feet deep)
Poorvanchal Expressway
Length: 212 miles
Cost: $1.5 Billion
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