The deadline for the completion of the $1.8bn mega-merger of Hyundai Heavy Industries Group shipyards with Daewoo Shipbuilding & Marine Engineering (DSME) has been moved back to the summer.

Korea Shipbuilding & Offshore Engineering (KSOE), the Hyundai group's shipbuilding holding company, said in a stock-exchange filing that the contract for the acquisition of DSME has been revised with seller Korea Development Bank (KDB).