In the design of Uniswap, price slippage of a single transaction is determined by the scale of the reserves. The more mass the reserve has, the less the price slippage will be given the same deal. Therefore, BlackHoleSwap adds "virtual" liquidity in the existing model of Uniswap, just like the structure of the iceberg being more massive underwater. Accordingly, given the same amount of "real" reserves, BlackHoleSwap demonstrates a lower price slippage. Moreover, the number of real reserves can be smaller than 0, which is negative stocks or so-called liability.