CUPRIJA, Serbia, April 30 A Belgrade University lecturer and three students died while exploring a 5,000-foot deep cave at Cuprija, Serbia, media said.The three students, ages 23 to 25, and their lecturer of the Belgrade geological and mining faculty, tried to dive through water-filled pockets of the Ravanicka cave at Cuprija, 90 miles southeast of Belgrade, the Serbian B92 radio reported.Investigators said Monday the four, lecturer Sasa Colic, 35, and the three students, Bosko Madzarevic, Fulip Avramovic and Bojan Borokic, died of carbon-monoxide poisoning, Serbia's RTS radio-television said.The four men were members of Serbia's association of paleontologists. They were part of a nine-member team exploring the cave during the weekend. The other five people were not involved in the accident.Copyright 2007 by UPI
