When all options run out, the last-ditch defence is imposing price limits so that the stock market can't plunge:
Does it work? Of course it doesn't. When a financial crisis hits an economy, there's no way to save the stock market from tumbling. (BTW, I like the line 'Worries that Hitler has gone too far'. Indeed he had.)
Did I mention you should never ever in your life buy stocks in economies that have been struck with a financial crisis?