Divers and specialist firefighters were sent into the burnt out wreck of an oil tanker listing off Lamma on Wednesday afternoon to look for two crew members still missing after blasts and a fire on board the previous day.
A team of six Fire Services Department officers who boarded the ship in the morning failed to find the missing Vietnamese sailors after a search of the deck.
As of 6.30pm, the search mission was still underway, officials said, more than 30 hours after the blaze broke out, killing one member of crew and injuring four other workers.
More than 20 crew members had to be plucked from the sea following the explosions which happened when the crew of the Vietnam-registered Aulac Fortune connected pipes to a barge for refuelling.
The Government Flying Service had joined Tuesday's operation to put out the fire and rescue those on board the two vessels.