A single unconfirmed transaction is moving 253.24 BTC across the network. It is not yet in a block and can be replaced.
According to SENTINEL event ux_11aawwu (source mempool.space): 253.24 BTC ENTERED THE MEMPOOL. Verify: https://mempool.sentinelbtc.com/api/v1/events/unusual/ux_11aawwu