What is liquidation?
Liquidation happens when a trader does not have sufficient funds to cover the maintenance margin, meaning all the positions will be closed. The liquidation price is subsidiary to unrealised PnL. When the Mark Price of a contract falls below your liquidation price for long orders or rises above your liquidation price for short orders, your Maintenance Margin level has been breached and the Liquidation Engine takes over your position. A notification email will be sent if a trader happens to be liquidated.
Please note that liquidation is a process generated automatically, that cannot be stopped if already started. For this reason, CoinDeal Derivatives recommends all traders to pay attention to their margin level, and use stop losses to avoid unwanted liquidation.