One of the main directions of research activities is the development of methods for deep underwater elementary particles detection and construction of detectors using vast bulks of water of natural reservoirs as target and working substances. At the Baikal Neutrino Station a unique large telescope NT-200 is now being constructed for deep underwater neutrino research with an effective detection area 2-11 thousand square meters (for atmospheric muons) and controlled water bulk of about 200 thousand cubic meters. The construction of this many-purpose setup will allow one to search for new elementary particles and rare processes and fulfill a large-scale experimental research program in the field of high-energy cosmic ray physics.