( CNN ) -- Divers have found what they believe are human remains on the wrecked Costa Concordia cruise ship , the Italian Civil Protection agency announced Tuesday . The bodies of two people from the 2012 wreck have never been found : Russel Rebello of India and Maria Grazia Trecarichi of Sicily have been missing but presumed dead . Their bodies have long been believed to be either trapped beneath or inside the ship . Italian authorities also said two weeks ago that divers found what they thought were human remains on the ship 's Deck 4 . But they later determined that the remains were animal . The cruise liner capsized after it struck rocks off Italy 's Giglio Island in the Tyrrhenian Sea in January 2012 , killing 32 of 4,200 people on board . The toll includes Rebello and Trecarichi . Rebello , 33 , was a cruise waiter who was last seen helping passengers off the ship . Trecarichi was on the cruise to celebrate her 50th birthday with her 17-year-old daughter , who survived . The new discovery of remains comes about three weeks after engineers managed to rotate the ship back to vertical . Before that , the ship rested 20 months on its side , hindering a full examination . Costa Concordia righted . Authorities say the ship struck the rocks off Giglio Island after the captain , Francesco Schettino , ordered the liner to veer more than four miles off course to salute a former sea captain who had retired on Giglio . Schettino faces charges of manslaughter , causing a maritime disaster and abandoning ship with passengers still on board . His trial , which began with preliminary hearings in March , resumed last month . The trial is expected to last through the fall with a string of witnesses , including passengers , crew members and islanders , who say they saw the captain on shore looking for dry socks before all the passengers had been safely evacuated . Schettino argues that he is a hero who saved the lives of more than 4,000 people , not a villain whose negligence led to the deaths of 32 . His defense is trying to prove , among other things , that the ship 's watertight doors did not function properly , and that is the reason the ship sank , leading to all 32 deaths during evacuation . Schettino also has told the court that the ship would not have crashed had his helmsman turned it in the direction that Schettino told him to 13 seconds before impact . The helmsman , Jacob Rusli Bin , and four others were convicted in a plea deal in July for their role in the disaster . A Florence court is considering the validity of those plea bargain agreements . CNN 's Hada Messia , Jason Hanna and Barbie Latza Nadeau contributed to this report .
Of 32 declared dead in the Costa Concordia accident , two bodies have yet to be recovered . The cruise ship struck rocks off Italy 's Giglio Island in January 2012 . Engineers rotated the ship back to vertical last month .