The boat sank on Thursday in the lake-side port of Goma in the Democratic Republic of Congo, but only 30 bodies have been recovered so far.
Officials say the work is being hampered by a lack of basic equipment.
Operations were also delayed when two divers were arrested for allegedly stealing money from the corpses, police said. Francs found When they failed to recover any bodies after spending Saturday morning in the water, naval authorities ordered them to remove their wet suits. Officials said Congolese franc notes were found tied to their bodies with twine. But they were later ordered to continue their work, because of the scarcity of divers. The private entrepreneurs involved in the salvage operation said the ferry had been carrying hundreds of foam mattresses, and that once water-logged, they blocked the exit from the ship's cabin.