Most traders assume a crash means volatility stays high. The more useful truth is the opposite: after the first violent leg down, implied volatility tends to collapse — and that collapse is where the opportunity hides.
The fear premium decays
Implied volatility (IV) is the market's price for uncertainty. When a stock is falling hard, IV spikes — option buyers pay up for protection and lottery tickets, and sellers demand a fat premium for the risk. But that panic premium is not permanent. Once the selling exhausts and price stabilizes — even at a much lower level — realized volatility drops, and IV mean-reverts downward to meet it. Practitioners call the move a volatility crush.
What gets cheap
When both price and IV are depressed, far-out-of-the-money, long-dated calls become inexpensive in absolute terms. The same strike that commanded a rich premium in calm markets can trade at a steep discount after a crash has settled. You are, in effect, buying convexity on sale: a small, defined outlay for a large, asymmetric payoff if the name recovers.
The vega lens
In Greek terms, you are long vega — sensitivity to volatility — at a moment when vega is cheap. If IV later re-expands during a recovery (it usually does), that alone adds value to the position before the stock has moved much at all. Buy volatility when no one wants it; you can always sell it back when they do.
The honest caveat
Cheap is not the same as free. A depressed stock can stay depressed, and a long call can expire worthless. The volatility cycle is a probabilistic edge, not a guarantee — position size accordingly, and treat the premium you pay as money you are fully prepared to lose.
This idea is the entry leg of a full structure I've written up separately — buying that cheap call, then financing it by selling expensive volatility into the recovery. Read the complete method in The Reaper's Inverted Diagonal.