When the Hunts ran out of money, they simply borrowed more to buy more silver, causing the price to jump by about 700% in 1979 alone. Not only did they buy 100,000,000 troy ounces of silver, which was somewhere between 33% and 50% of the world's transportable supply, but they also insisted on taking actual physical control of the stuff. They flew it to Switzerland on private jets under armed guard in the middle of the night, all so the U.S. government couldn't get them.
The madness that ensued was the world's most obvious asset bubble. People melted down their silverware. Thieves stole all the silver they could find. Tiffany & Co. even ran an attack ad against the Hunt brothers for making silver unaffordable to their customers. There were repeated attempts to stop the Hunts, including a straight-up freeze on buying silver that they did their best to ignore, so the Federal Reserve stepped in. It's basically their job to make sure this exact kind of lunacy doesn't happen, so an edict was issued that banned banks from loaning money to precious metal speculators. This was a rule specifically tailored to fuck over the Hunts, who abruptly ran out of credit and couldn't buy any more silver.
This led to "Silver Thursday," when the price of silver collapsed and the Hunts lost over a billion dollars. They were also found guilty on civil charges of conspiracy, and had to pay hundreds of millions in fines and various other settlements. Nelson Bunker Hunt broke the record for largest personal bankruptcy in American history, and had to sell his house, oil fields, bowling alley, and $12 million coin collection. Two of the Hunts later moved on to trying to corner the market on harps and/or pitchforks, but William Herbert Hunt is still around and worth $2.6 billion, because rich people aren't truly allowed to fail.