A single unconfirmed transaction is moving 355.45 BTC across the network. It is not yet in a block and can be replaced.
According to SENTINEL event ux_1oul5jb (source mempool.space): 355.45 BTC ENTERED THE MEMPOOL. Verify: https://sentinelbtc.com/api/v1/events/unusual/ux_1oul5jb