Do they have bottom limits any more?
Somebody posted a chart last week. There are several stop points depending on how fast it falls and what time of day.
I think there are “circuit breakers”, which disable automated program trading - but there’s not an actual limit down. You just need to actually place the trades, after a large enough point swing.
As they say “don’t try to catch a falling knife”, but there are certainly all sorts of buy opportunities in someone’s future...