Here's a video link to an old movie showing men hand forging massive chain/links used by Navy and commercial ships. The 2nd half shows another gang of men building up a HUGE anchor by hand. Watching the incredible teamwork of men hammering on the anchor assembly. Looks like a sledge hammer ballet - a moving wave of hammers with each man getting out of the way just in time.
I had NO idea how those anchors were made - thought they were cast in one piece, not built up like that !!