Thrill quest

Thrill Quest is a history and adventure tour company based in Plitvice, Croatia, specializing in guided underground adventures at the Zeljava Airbase, also known as Objekt 505 or Klek. The company offers unique guided tours through over 3 kilometers of massive secret tunnels carved into the mountain, once designed to protect military jets during the Cold War era. Zeljava Airbase was one of Yugoslavia's most strategic and expensive military projects, engineered to survive a 20kt nuclear attack and capable of functioning continuously for 30 days without outside support. At its peak, the airbase housed 58 fighter airplanes. During the outbreak of the Yugoslav war, the base was destroyed to prevent it from falling into opposing forces' hands. Thrill Quest provides expert local guides who bring the airbase's history and secrets to life, offering safe exploration of hidden rooms, abandoned documents, intelligence laboratories, pilots' health-check rooms, and powering facilities. The tours are available in English and Croatian, with a 99% client satisfaction rate. Tours are available for public groups of 2-6 people (max 15) and private groups up to 50 people. The company is highly rated on TripAdvisor, GetYourGuide, and Google Business.