A single unconfirmed transaction is moving 166.39 BTC across the network. It is not yet in a block and can be replaced.
According to SENTINEL event ux_o2iw2f (source mempool.space): 166.39 BTC ENTERED THE MEMPOOL. Verify: https://sentinelbtc.com/api/v1/events/unusual/ux_o2iw2f