▁died ▁during ▁construction , ▁but ▁surprising ly ▁only ▁two ▁from ▁falling ▁off ▁the ▁bridge . ▁Several ▁more ▁were ▁injured ▁from ▁unsafe ▁working ▁practices ▁undert aken ▁whilst ▁he ating ▁and ▁inserting ▁its ▁riv ets , ▁and ▁the ▁de af ness ▁experienced ▁by ▁many ▁of ▁the ▁workers ▁in ▁later ▁years ▁was ▁bl amed ▁on ▁the ▁project . ▁Henri ▁Mall ard ▁between ▁ 1 9 3 0 ▁and ▁ 1 9 3 2 ▁produced ▁hundreds ▁of ▁still s ▁and ▁film ▁foot age ▁which ▁reve al ▁at ▁close ▁qu arters ▁the ▁bra very ▁of ▁the ▁workers ▁in ▁t ough ▁De pression - era ▁conditions . ▁ ▁Inter views ▁were ▁conducted ▁between ▁ 1 9 8 2 - 1 9 8 9 ▁with ▁a ▁variety ▁of ▁tr ades men ▁who ▁worked ▁on ▁the ▁building ▁of ▁the ▁bridge . ▁Among ▁the ▁tr ades men ▁interview ed ▁were ▁dr ill ers , ▁riv eters , ▁concrete ▁pack ers , ▁bo il erm akers , ▁rig gers , ▁iron work ers , ▁pl aster ers , ▁st on em asons , ▁an ▁official ▁photograph er , ▁sleep cut ters , ▁engine ers ▁and ▁dra ug ht s men . ▁ ▁The ▁total ▁financial ▁cost ▁of ▁the ▁bridge ▁was ▁A U £ 6 . 2 5 ▁million , ▁which ▁was ▁not ▁paid ▁off ▁in ▁full ▁until ▁ 1 9 8 8 . ▁ ▁Open ing ▁The ▁bridge ▁was ▁formally ▁opened ▁on ▁Saturday , ▁ 1 9 ▁March ▁ 1 9 3 2 . ▁Among ▁those ▁who ▁attended ▁and ▁gave ▁speech es ▁were