- All text materials are prepared by Vladimir Kalinin at assistance of Nikolay Ajushin, Alexandr Stekhov (Vladivostok) and Nikolay Gavrilkin (Moscow).
- The Vladivostok Club of the researches of underground objects (VCRU) is a youth noncommercial non-governmental organization. The club is in Vladivostok-city of Russian Federation, it on a coast of the Japanese sea. Areas of activity: study of artificial underground structures, ecological projects (the help the Greenpeace of Russia and nature protection patterns), extreme tourism. The members of club are the correspondents of the newspapers & television, policemans, students & pupils. VCRU together with the children's ecological ciub "Rainbow" issues the newspaper "Rainbow Warrior".