vessel Mary Sears. The flight data recorder was located at at a depth of , while the cockpit voice recorder was located at at a depth of , approximately apart. The Indonesian vessel Fatahillah travelled to the location. The Mary Sears used its side scan sonar (SSS) unit to map an area of approximately 10.3 km2 (3 sq nmi) around the recorders in high resolution, an operation that required 18 passes across the area at approximately , taking six hours per pass including lining up for the next pass. It discovered a large amount of wreckage in the area, which was considered to be all that remained of the aircraft. A senior Indonesian marine official said on 24 January that he did not believe that the equipment required to retrieve the boxes from that depth was available in any Asian country. The black boxes had a battery life of just 30 days, and would subsequently be unable to emit locator signals. On 3 February, Indonesian naval vessel KRI Tanjung Dalpele took affected families out to the crash site where a memorial service was held, which included throwing flowers into the sea. Salvage On 26 January 2007, a dispute arose between Adam Air and the Indonesian government regarding the retrieval of the black boxes. Due to the depth involved, recovery required an underwater remotely operated vehicle, but Indonesia did not have such equipment. Vice-president of Indonesia Jusuf Kalla went so far as to question the need to retrieve the black boxes at all, although experts said in response that the accident was of international significance as it could indicate a fault with the aircraft. Adam Air said that in its opinion, the black boxes should be recovered, describing the accident as being relevant on both national and international levels, but refused to pay, saying that was the responsibility of the government. Indonesia did request technical assistance from the United States, Japan and France. Jim Hall, a former chairman of the US National Transportation Safety Board, said that it was essential the boxes be recovered quickly, as at that point their 30-day battery life was about to expire, which subsequently did happen. He cited problems such as poor visibility and strong currents making it difficult to recover the devices without the signal. On 31 January, it was reported that the US had to withdraw the vessel Mary Sears from the searches, the