Media playback is unsupported on your device Media caption Some of the survivors swam for seven hours, reports Karishma Vaswani 
 
 Two foreign tourists are still missing after a boat sank off the coast of eastern Indonesia on Saturday. 
 
 Twenty foreign tourists, an Indonesian guide and four crew were on board when the boat foundered near Sangeang Api, a volcanic island off Sumbawa. 
 
 Ten people were rescued initially and another 13, including all the crew, were found alive early on Monday. 
 
 They are being treated in hospital for trauma and dehydration as a search continues for the remaining two people. 
 
 The Indonesian military has joined the search to find the two remaining tourists, a Dutch man and an Italian woman. 
 
 Speedboats and a helicopter have been deployed, but authorities say rescue efforts are hampered by bad weather and high waves. 
 
 Officials said the incident took place when the boat, sailing from Lombok island to Komodo island, hit a wave that was 3m high and crashed into a reef. It sprung a leak and sank. 
 
 Rescue officials told agencies that the second group were found together by fishermen. Some of them were in a lifeboat while others were floating in their lifejackets. 
 
 The survivors were now recovering in Sape city in Sumbawa, they said. 
 
 Image copyright AFP Image caption A group of survivors rest at a house near the Indonesian town of Bima following the sinking on Saturday 
 
 Image copyright EPA Image caption The survivors split into two groups shortly after the boat sank 
 
 Survivors said that as the boat started sinking, some got into a lifeboat which could only take up to seven passengers. Others climbed onto the roof of the boat which had not yet completely sunk. 
 
 They eventually split into two groups when it became clear that there were not enough lifeboats nor communication tools to call for help. 
 
 One group decided to swim six to seven hours to reach Sangeang Api, while the others stayed with the lifeboat. 
 
 French survivor Bertrand Homassel was in the first group. He told AFP: "We were 5km (three miles) from the coast and there were many big waves separating us from the coast. People started to panic and everyone took the decision to swim to the closest island." 
 
 After spending the night on the island by eating leaves and drinking their own urine, that group was rescued by a passing boat on Sunday. 
 
 The other survivors who stayed with the lifeboat, who were rescued on Monday, were in the water for about 40 hours. 
 
 Dutchman Jan van Ommen said people took turns to spend time in the lifeboat and float in the water with their lifejackets. 
 
 "So we had this system, and in the beginning it was not easy... but later on the system went on, and we changed and changed," Mr van Ommen told AFP. 
 
 The other tourists came from the UK, Germany, Spain, and New Zealand. 
 
 The UK Foreign Office says two British nationals were hospitalised following the incident. 
 
 The BBC's Alice Budisatrijo in Jakarta said the boat was on a three-day journey through some of Indonesia's most picturesque islands. 
 
 Boats are the main form of transport in some parts of Indonesia, but accidents are common because of poor safety standards. 

 MATARAM, Indonesia (AP) — Rescuers on Monday safely recovered 13 more people from a tourist boat that sank after hitting a reef in central Indonesia, but were searching for a Dutch man and an Italian woman who were still missing, officials said. 
 
 In this image taken from video Sunday, Aug. 17, 2014, a male survivor is escorted to a clinic by rescue team in Lombok, Indonesia, after a boat sank Saturday evening on its way from Lombok island to Komodo... (Associated Press) 
 
 In this image taken from video, Dutch survivor of boat sinking, Eli Visser, in pink T-shirt, talks to friends at Ngurah Rai Airport in Bali, Indonesia, Monday, Aug. 18, 2014. Rescuers on Monday safely... (Associated Press) 
 
 In this image taken from video, Dutch survivor of boat sinking, Eli Visser, in pink T-shirt, talks to friends at Ngurah Rai Airport in Bali, Indonesia, Monday, Aug. 18, 2014. Rescuers on Monday safely... (Associated Press) 
 
 In this image taken from video Sunday, Aug. 17, 2014, survivors are checked by paramedics in Lombok, Indonesia, after a boat sank Saturday evening on its way from Lombok island to Komodo island. Rescuers... (Associated Press) 
 
 The boat sank Saturday evening on its way from Lombok island to Komodo island carrying 20 foreign tourists, four Indonesian crewmen and an Indonesian guide. Ten people — all foreigners — were rescued Sunday. 
 
 Eight more foreign tourists and all five Indonesians were found early Monday, said Lalu Wahyu Efendi, operational chief for the search and rescue agency in Mataram, the provincial capital of West Nusatenggara. 
 
 He said the 13 were rescued by fishermen about 43 kilometers (27 miles) east of where their wooden boat sank off Sangeang Api, a volcanic island in Bima district off the eastern coast of Sumabwa island. 
 
 Most of those who were rescued had minor injuries, said Efendi, adding that rescuers were still scouring the waters for the two missing foreigners. 
 
 A woman who was rescued Sunday told MetroTV that she and the others swam for hours before being found. 
 
 "It was a terrible experience. We swam in choppy waters for seven hours before being found by a fisherman," said the woman, identified only as Maria. 
 
 The rescued foreigners included five Dutch, four Germans, three Italians, two each from Spain and New Zealand, and one each from France and Britain, said Sutopo Purwo Nugroho, the spokesman for Indonesia's disaster management agency. 
 
 The boat was hit by a 3-meter-high (10-foot-high) wave in bad weather and crashed into a reef, causing it to leak and sink, Nugroho said. 
 
 The tourists had embarked Thursday on a tour taking them from the resort island of Bali to Komodo island, including a stop on Lombok. A boat trip from Lombok to Komodo can take up to 15 hours. 
 
 Komodo is part of the Lesser Sunda chain of islands and forms part of Komodo National Park, which is known for endangered Komodo dragons that can grow longer than 3 meters (10 feet). 
 
 Boat accidents are common in Indonesia, a sprawling archipelago nation of more than 17,000 islands, in part because of poor safety standards. 
 
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 Associated Press writers Niniek Karmini and Ali Kotarumalos in Jakarta, Indonesia, contributed to this report.
– When a tourist boat sank off the coast of Indonesia on Saturday, 25 people went into the water. One group of 10 survivors had to swim six or seven hours, eat leaves, drink their own urine, and dodge an erupting volcano on an island; the second group of 13 survived 40 hours in a lifeboat on the open water. Those who stayed behind took turns between being in the boat and the water. "We had this system, and in the beginning it was not easy," says one survivor. All 23 were rescued yesterday and today, the BBC reports; search and rescue crews are still looking for two missing passengers, believed to be a Dutch man and Italian woman, the AP adds. The tourists' boat was making the 15-hour journey between the islands when it hit a 10-foot wave and then a reef, which caused it to leak and then sink. With little room on the lifeboat, the group of 23 decided to split—some stayed with the lifeboat and the rest swam. "It was a terrible experience. We swam in choppy waters for seven hours before being found by a fisherman," one survivor tells the AP. All 23 are now recovering in Sumbawa. (A camera from a 2012 shipwreck off Vancouver Island was recently found.)