A platform that can be lowered below the water and a ship can be lifted out of the water by big winches that lift the platform once the ship is above it.
Yiplafomu enokuhliselwa ngaphantsi kwamanzi kwaye inqanawa inokuphakanyiselwa ngaphandle kwamanzi ngesixhobo sokunyusa into esiphakamisa iplatfomu nje ukuba inqanawa ibe ngaphezulu.