A new computer system has been designed to stop ships sinking.The greater danger to holed vessel is that flooding of its compartments will make the ship unstable enough to capsize.It is estimated that nearly half the ships lost during the second world war capsized because of loss of sability.Pacer Systems of Burlington.Massachusetts,has now reineda system（）by a reserve US Navy officer,Stephen Drabouski,which effectively thought out alternative strategies for the ship.