Meanwhile,... Korean and Hungarian authorities are ramping up search efforts for the missing 21 passengers.<br />They plan to deploy helicopters and speed boats on Sunday,... after surface-level searches on Saturday failed to locate any missing passengers.<br />Prior rescue and recovery attempts were hampered by flooding and strong currents as well as poor water visibility.<br />On Monday, authorities are set to decide whether to launch full-scale underwater operations by deploying divers. <br />
