Diving teams are working to find the device commonly referred to as black boxes and which can help investigators link the brand new Boeing 737 last moments before crashing and killing all 189 people on board.
The aircraft recorder is on Thursday, but investigators claim they have not been able to get any information from it.
Muhammad Syaugi, head of the Indonesian Research and Rescue Agency, Basarnas, told reporters in Jakarta on Saturday that divers have now heard a "ping" of the second black box.
"Although the sound was rather weak, it was not far from the venue of the ship's" Victory ", he added, referring to one of the vessels involved in the search effort.
Syaugi said he "received information about finding the tribe" of the team at the scene though he had not seen himself yet. More than 100 divers are currently working in different zones, doing various searches, he added.
The rapid-moving currents and muddy waters of accidental locations in the Java Sea prevented recovery efforts, as the plane came soon after Jakarta's voyage.
Death of a diver
The news on search efforts was confirmed after Saturday's confirmation that one of the scuba diving victims and wreckers died.
Anto Syahrul, 48, was unconscious on Friday when his diver partner noticed that he had disappeared, Syaugi said. He returned to the beach immediately, and doctors attended, but Syaugi said, "God has another plan."
Anto was a skilled, senior diver, "who devoted his life to our country," said Syaugi.
Syaugi, who is responsible for the diving team, told stakeholders: "He is a well-trained divers, prominent divers, long-time experts from the Navy special teams, the police, the Basarnas team, and some volunteers from diving clubs."
"Broken Parts" in the Flight Recorder
They strive to extract the information from the Flight Recorder, which should include valuable information on whether the aircraft systems are performing in the moment before the accident, continued the Sabbath.
Investigators have cleansed the salt content from their memory card to download the data from the NAK, Nurcahyo Utomo (KNKT), the Indonesian National Security Corps.
The memory card did not cause any other damage, and investigators hope to download data on Sunday with an Australian team.
"This process has to be very cautious," said Utomo.
Earlier on Saturday, investigators were unable to download anything from the recorder because "there are some broken parts" in the device, the KNKT said.
Boeing and the United States National Road Safety Director launches special equipment in Indonesia to help local authorities extract information, writes Haryo Satmiko.
The aviation officer, who was caught in an accident investigation on Friday, told CNN that the recorder was so deeply into the water that it was difficult to overcome the data.
They think that it is a rear tipping wheel, from the plane they made to the NATC on Saturday. Divers are still trying to find the cockpit voice recorder, he told CNN.
Analysts say exploring a cockpit voice recorder is essential if investigators want to see if the accident affects other airlines that operate thousands of Boeing 737 flights a day worldwide.
"We need to know if there is a Lion Air problem, a specific problem for this plane, or generally a general problem in the 737s," said Geoffrey Thomas, chief editor of Airlineratings.com air news agency.
It is not yet clear what state the main strain is. Most of the wreckage of the airplane is deeply in the water and is so crushed that analysts say most of the recovery is likely to be done manually or with nets.
David Soucie, CNN Flight Safety Analyst, said the divers were challenging to identify and separate body parts from other debris.
"Look at the insulation and the seatbacks, seat cushions are easily mistaken for body parts and vice versa," Soucie said.
Only one victim was identified
Flight 610 had to endure one hour trip between Jakarta and Pangkal Pinang on the island of Bangka. Instead, it crashed 13 minutes after takeoff. The pilots asked to call but did not send an emergency call.
At least 65 bodybags have been collected since the start of the search and rescue operation, although each bag may contain more than one person's remains.
Investigators need to rely on DNA samples to identify the victims due to the status and size of the remains found. The police took 181 DNA samples from the victims' families and used 272 human tissue samples.
Lisda Crab, the leader of the Disaster Victim Identification, told reporters Friday that only one person was identified by using a female fingerprint.
On Wednesday, the authorities began bringing relatives to the port to identify the personal belongings of the victims, which were placed next to pillows and other debris that came from the airplane.
Epi Syamsul Qomar, whose 24-year-old son was on the plane, burst into tears when he recognized his son's shoes.
"I saw my son's black shoes," he told CNN. "I also saw the bank checkbook."
The pilot reported flying aviation issues
The previous day, jetliner had experienced technical issues on a different route, passengers at a CNN flight.
"In the air, after 10 minutes, the plane dropped like it lost power, people panicked, dropped to about 400 feet," said Gaharu, adding that he had confirmed the height of the droplet on the flight tracking website. He said the drop felt he was "really in a very deep hole".
Lion Air confirmed to CNN that the plane crashing on Monday had been used on the JT43 Bali-Jakarta route yesterday and the Indonesian authorities confirmed that Sunday flight was a pilot problem for one of the aircraft's aircraft.
General Daniel Putut Kuncoro Adi, Executive Director of the Lion Group, said that all the information was passed on to the National Security Committee of Indonesia and was unable to answer any questions about the defect due to the confidentiality agreement signed for the investigation.
CNN Eric Levenson, Masrur Jamaluddin, Yosef Riadi, Edi Amin, Hira Humayun and Nicole Chavez have contributed to this report.