Moscow ( CNN ) -- Specialist military divers have arrived at the site where a Russian cruise ship sank over the weekend , killing more than 100 people , the Russian Defense Ministry said Wednesday . The highly trained divers , who specialize in rescue operations and lifting sunken ships , have orders to present a plan to raise the `` Bulgaria '' from the Volga River as soon as possible , the ministry said in a press release . Some of the divers participated in lifting the Russian nuclear submarine `` Kursk , '' which exploded and sank in the Barents Sea in August 2000 , the Defense Ministry said . The bodies of two more children were recovered Wednesday from the ship , Russian authorities told CNN , bringing the number of bodies recovered to 102 . There are still 20 people missing of the more than 200 people believed to have been on the vessel , officials said . At least 85 of the victims have been identified , the Emergency Situations Ministry said . Four people face charges over the sinking of the ship Sunday , which Russian media are calling the most devastating river accident in the country 's history . The vessel went down in the Russian republic of Tatarstan . Svetlana Inyakina , general director of Argorechtur , the company that rented the cruise boat `` Bulgaria , '' and Yakov Ivashov , a manager at the Kama River Register , have been detained , Russia 's Investigative Committee said . They are charged with providing services that do not meet safety standards which resulted in multiple deaths , and if convicted could be jailed for up to 10 years . Criminal charges are also being brought against the captains of two ships that are accused of passing the sinking boat without stopping to help the people in the water , the committee said . They could face heavy fines or up to three years in prison . Russian Transport Minister Igor Levitin , who is also head of the special government commission investigating the accident , said divers will search around the clock until all of the victims are found . Recovery efforts will also include small planes conducting reconnaissance flights as far as 80 miles downstream , the minister said . There were 175 scuba divers working on the scene , authorities said Tuesday . Russian state TV said they were working underwater in low visibility and against a heavy current that is moving the boat , which is lying at the bottom of the river . Russia observed a day of mourning Tuesday with church services all across the country , flags flying at half-staff and national television canceling all entertainment programming . Prime Minister Vladimir Putin said the federal government would pay 1 million rubles ( $ 35,500 ) to the families of each of the dead . He also promised 400,000 rubles ( $ 14,250 ) to those who suffered major and moderately severe injuries , and half that sum to people with minor injuries . Among the bodies to have been recovered are those of the ship 's captain Alexander Ostrovsky and his wife , local officials in Tatarstan told Russian media at the site of the accident . At least 79 people were rescued , some of whom have been released from hospitals after receiving medical treatment , according to government agencies . The ship did not have a license to transport passengers , was overloaded , and was last repaired more than 30 years ago , the Russian Prosecutor 's Office said Monday . Prosecutors also established that the left engine of the ship was damaged , they said on their website . Russian state TV reported the vessel had an operational limit of about 150 passengers , citing a top government official on site . State TV also reported , citing law enforcement officials , that there were life vests on board for only 156 people . Emergency Situations Minister Sergei Shoigu said earlier there were 208 people aboard the ship , of whom 25 passengers were not officially registered and did n't have tickets . The state news agency RIA Novosti reported that 205 people were on board . The ferry was built in 1955 in Czechoslovakia , according to Russian law enforcement officials . The double-deck cruise ship went down near the village of Syukeyevo in Tatarstan , about 80 kilometers ( 50 miles ) south of the city of Kazan . Kazan is about 724 kilometers ( 450 miles ) east of Moscow . CNN 's Arkady Irshenko contributed to this report .
NEW : The bodies of two more children are recovered . Military divers are ordered to plan to raise the `` Bulgaria '' as soon as possible , the Defense Ministry says . More than 20 people are still missing . A man is pulled from a collapsed building in Sofia, Bulgaria, on Tuesday.