A single unconfirmed transaction is moving 1,655 BTC across the network. It is not yet in a block and can be replaced.
According to SENTINEL event ux_5d3uqw (source mempool.space): 1,655 BTC ENTERED THE MEMPOOL. Verify: https://sentinelbtc.com/api/v1/events/unusual/ux_5d3uqw