A former Alameda Research employee revealed that a human error led to an 87% drop in Bitcoin's value in October 2021. The error, a misplaced decimal point, caused Bitcoin to plummet from $65,000 to $8,000 on certain platforms. The incident had significant financial repercussions for Alameda, with losses estimated in the tens of millions. The firm has since implemented additional checks for manual trades to prevent such mishaps in the future.