Last Updated 12:53 p.m. ET
GIGLIO, Italy - Italian officials say two more bodies have been pulled from the wreckage of a cruise liner capsized off the Tuscan coast, bringing the number of confirmed dead to 15.
The discovery came as authorities announced salvage experts can begin pumping fuel from a capsized Costa Concordia as early as Tuesday.
The national civil protection agency official in charge of the search said Monday that divers recovered the bodies of two women from the ship's Internet cafe.
The recovery of the two brings to 17 the number of known missing since the Jan. 13 accident when the Concordia rammed a reef and sliced its hull with 4,200 on board.
However, officials over the weekend said it appeared unregistered guests were on board at the time of the accident, meaning the number of officially missing could increase.
Salvage experts can begin pumping fuel from the capsized ship as early as Tuesday to avert a possible environmental catastrophe and the ship is stable enough that search efforts for the missing can continue, Italian officials said.
The decision to carry out both operations in tandem was made after instrument readings determined that the Costa Concordia was not at risk of sliding into deeper waters, Franco Gabrielli, chief of the national civil protection agency, told reporters Monday on the island of Giglio.
"The ship is stable. ... There is no problem or danger that it is about to drop onto much lower seabed," Gabrielli said.
There are 17 people still unaccounted for, but Gabrielli has said an unregistered Hungarian woman might have been aboard ship. The woman's relatives have told Italian authorities they haven't heard from her since she called them to say she was aboard the ship.
The ship's Italian captain, Francesco Schettino is under house arrest near Naples as prosecutor's investigate him for suspected manslaughter, causing a shipwreck and abandoning his vessel while some passengers and crew were still aboard. He has insisted that he was coordinating rescue operations from a lifeboat and then from shore.
Costa Crociere SpA has distanced itself from the captain, contending that he made an unauthorized deviation from the programmed route. Schettino has reportedly told investigators that Costa officials had requested that he sail close to Giglio in a publicity move.
Schettino's lawyer, Bruno Leporatti, told reporters Monday that tests on urine and hair samples found that his client had not been under the influence of alcohol or drugs before the crash. Prosecutors could not confirm the report, since they cannot speak about the investigation while it is still under way.
Despite earlier fears, officials said the crippled cruise ship, with a 230-foot long gash in its hull, is not expected to roll off its rocky seabed perch and be completely swallowed by the sea.
An Italian geologist, on Giglio to monitor the Concordia, told Sky TG24 Monday the ship was barely moving.
"It is moving at the rate of about one or two millimeters an hour," said Nicola Casagli, adding the ship has moved up to 3mm an hour when tides come in or out. "The ship responds to the tides."
The sea has been calm for several days but he said waves were expected to grow larger in the next few days.
In all, seven bodies await identification, but Gabrielli said officials have DNA from the relatives of all of the missing passengers and are working to confirm names and nationalities. He said the search would continue "as long as it is possible to inspect whatever can be inspected."
Meanwhile, Italian Admiral Ilarione dell'Anna said the fuel removal could begin as early as Tuesday, addressing growing concern among residents and environmentalists that the heavy, tar-like fuel could leak from the ship's 17 double-bottomed tanks.