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ISTANBUL (AP) — Rescue experts from across Europe converged on a cave in Turkey on Thursday, launching an operation to save an American researcher who became trapped around 1,000 meters (3,000 feet) below the surface after suffering gastrointestinal bleeding.

Experienced caver Mark Dickey, 40, suddenly became ill during an expedition in the Morca cave in southern Turkey’s Taurus Mountains, the European Association of Cave Rescuers said.

Dickey, who had been bleeding and losing fluid from his stomach, is doing better, has stopped vomiting and has eaten for the first time in days, according to a New Jersey-based cave rescue group he’s affiliated with. It’s unclear what caused his medical issue.

The New Jersey Initial Response Team said Dickey is “very sick” and is located about 1,000 meters below the surface. The rescue will require many teams and constant medical care, the group said.

Communication takes about five to seven hours and is carried out by runners, who go from Dickey to the camp below the surface where wire communication to talk to the surface has been set up.

The New Jersey group says the cave is cold — about 4-6 C (39-42 F).

Dinko Novosel, a Croatian cave rescuer who is head of the European Association of Cave Rescuers, said that it will be a challenge to successfully rescue Dickey.

“This is very complex cave rescue operation,” Novosel said. “Until now, there is no case in the world where we had a bigger cave rescue operation.”

The operation to bring him up from the depths involves rescue teams from Bulgaria, Croatia, Hungary, Italy, Poland and Turkey. A telephone line has been dropped down in order to communicate with him.

Dickey experienced the gastrointestinal bleeding during his descent into the cave and he’s not able to hoist himself out on his own, the European Cave Rescue Association said on its website.

The group described Dickey as “a highly trained caver and a cave rescuer himself” who is well known as a cave researcher, or speleologist, from his participation in many international expeditions. He is secretary of the association’s medical committee.

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Experts say the rescue operation could take days or even weeks depending on conditions.

Dickey was on an expedition mapping the 1,276-meter (4,186-feet) deep Morca cave system for the Anatolian Speleology Group Association (ASPEG) when he ran into trouble about 1,000 meters down, according to Yusuf Ogrenecek of the Speleological Federation of Turkey.

Ogrenecek told The Associated Press later Thursday that Dickey’s condition had stabilized and was improving. He said the American was in “good spirits” and doctors would decide if Dickey can leave the cave on a stretcher or under his own power.

Turkish disaster relief agency AFAD and rescue team UMKE are working with Turkish and international cavers on a plan to hoist Dickey out of the cave system, the rescue association said.

The rescue effort involved more than 170 people, including doctors, paramedics who are tending to Dickey and experienced cavers, Ogrenecek said, adding that the rescue operation could take up to two to three weeks. But it could take shorter depending on the situation.

A team of rescuers from Italy’s National Alpine and Speleological Rescue Team will be flying to Turkey on Thursday night. A total of around 50 rescuers will be at the entrance of the cave early Friday ready to participate in the operation directed by Turkish authorities.

Marton Kovacs of the Hungarian Cave Rescue Service said that the cave is being prepared for his safe extraction. Narrow passages are being widened to accommodate a stretcher, and the danger of falling rocks is also being addressed.

The rescue teams hope that the extraction can begin on Saturday or Sunday. Kovacs said that lifting Dickey will likely take several days, and that several bivouac points are being prepared along the way so that Dickey and rescue teams can rest.

The cave has been divided into several sections, with each country’s rescue team being responsible for one section.

The Hungarian Cave Rescue Service, made up of volunteer rescuers, was the first to arrive at Dickey’s location and provided emergency blood transfusions to stabilize his condition. An additional Hungarian team of 15-20 rescuers will eave Hungary on Thursday evening on a military plane provided by the government and arrive at the rescue site on Friday morning, Kovacs said.

Six mountain rescuers, including two medics, have left for Antalya to help in the rescue operation, Jerzy Siodlak, the head of Poland’s mountain rescue service, GOPR, said Wednesday on Radio RMF24.

Thirteen other rescuers from southern Poland are also ready to join the rescue operation, GOPR authorities said. Siodlak noted the operation will be a challenging one given the condition of the American and the need to keep him medically fit for the rescue operation in difficult conditions.

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Mike Catalini in Trenton, New Jersey, Darko Bandic in Zagreb, Croatia, Justin Spike in Budapest, Hungary, Aritz Parra in Madrid, Monika Scislowska in Warsaw, Poland, and Patricia Thomas in Rome, contributed to this report.