The other two kind of knew what sort of place it was, but at one point they were so concerned at how long the first one was taking, they decided to go in and rescue him

He'd payed his money, but swore blind not much happened

The whole premise was, they had dismantled on old Bridge back in England and were supposed to be reassembling it over a large ravine in America, so some Chokanaw Indians could get more visitors to their .
In reality the shows producers slowly edited or photoshopped bits of the Bridge out on the final edit / cut, over about 3 episodes, to make it look like it was being dismantled, but in real life it still exists where it was.