The Internet reported that a cryptocurrency trader was suspected to have suffered a "sandwich attack" while trading in Uniswap V3's USDC-USDT liquidity pool on Wednesday, resulting in his USDC worth US$732,000 being exchanged for US$18,600. The loss exceeded US$700,000. According to online data analysis, this incident may have been initiated by a MEV (Maximum Extractable Value) robot. The robot cleared the liquidity pool by pre-empting transactions, causing price imbalances, and paid block builders to prioritize their transactions. DeFi researcher Michael Nadeau pointed out that such attacks use transaction sequences to manipulate prices to make a profit. In addition, some analysts speculate that such unusual transactions may be part of money laundering. DeFiLlama developer 0xngmi said that by constructing transactions that are easily arbitrated by MEV robots, money launderers can transfer funds with almost zero loss. Currently, the incident is still under further investigation.