▁There ▁was ▁also ▁considerable ▁transport ▁infrastr ucture ▁activity , ▁including ▁on ▁the ▁Hern and arias ▁Sub fl uv ial ▁T unnel , ▁Argentina ▁in ▁the ▁ 1 9 6 0 s ▁and ▁the ▁New ▁El be ▁T unnel ▁in ▁Hamburg ▁in ▁the ▁ 1 9 7 0 s ▁ ▁By ▁the ▁mid - 1 9 7 0 s , ▁foreign ▁work ▁( such ▁as ▁the ▁Bos por us ▁Bridge ▁in ▁Turkey , ▁completed ▁ 1 9 7 4 ) ▁was ▁acceler ating ▁while ▁domestic ▁orders ▁were ▁re ced ing , ▁according ▁to ▁the ▁company ' s ▁annual ▁report ▁of ▁ 1 9 7 5 . ▁By ▁ 1 9 8 0 , ▁foreign ▁work ▁account ed ▁for ▁more ▁than ▁ 5 0 % ▁of ▁Ho cht ief ' s ▁business . ▁A ▁major ▁factor ▁was ▁the ▁contract ▁for ▁King ▁Abd ul az iz ▁International ▁Airport ▁( comple ted ▁ 1 9 8 1 ), ▁the ▁largest ▁air port ▁in ▁Sa udi ▁Arab ia , ▁and ▁the ▁most ▁valuable ▁contract ▁Ho cht ief ▁had ▁ever ▁been ▁involved ▁with . ▁The ▁architecture ▁of ▁the ▁air port ▁is ▁highly ▁r ated ▁a est het ically , ▁and ▁it ▁has ▁several ▁unusual ▁features , ▁including ▁Terminal ▁Three , ▁used ▁only ▁during ▁the ▁H aj j , ▁reserved ▁for ▁pil gr ims ▁trav elling ▁to ▁Me cca . ▁It ▁has ▁a ▁tent - sh aped ▁fib reg lass ▁roof , ▁contains ▁a ▁mos que , ▁can ▁accommod ate ▁ 8 0 , 0 0 0 ▁trav ellers ▁at