Waves the cryptocurrency went through the so-called flash crash. A sell order, probably ‘market’ with no limit price, for 506,000 WAVES was executed, dragging its price to as low as 0.0000001 BTC (or $0.00052), as seen on the chart below. The sell-off almost cleared the entire order-book of the WAVES/BTC trading pair on Binance exchange. source
Flash crash can be an honest mistake on putting orders, lucky for those who wait at that below orders. They already had its profit