Biggest drop in hash-rate was in May/June 2021 when it dropped ~60% or something like that (https://www.blockchain.com/charts/hash-rate https://www.blockchain.c

Biggest drop in hash-rate was in May/June 2021 when it dropped ~60% or something like that (https://www.blockchain.com/charts/hash-rate https://www.blockchain.com/charts/hash-rate), but yes, it did survive that (as the network is still running, online and working as it should). The all-time high of hash-rate for Bitcoin was in May this year.