Aim: To investigate new methods in discovering hidden graves and based on this to bring recommendations for the best methods in discovering of hidden graves depending on context, characteristics, and other burial features. Methods: Searched databases: Web of Science, Scopus and Open Gray. Search criteria were: „clandestine grave“ and „detection“, no limitations/ „mass grave“ and „detection“, no limitations). The search results were downloaded into Excel programme, after which duplicates were deleted and the remaining papers analysed. By reviewing the abstracts, all papers which did not correspond to the theme or to the research criteria were excluded. Results: 173 scientific papers were found, after deleting the duplicates 153 papers remained. Through a detailed analysis 55 papers were selected as relevant for processing. Advantages and disadvantages of classical (intelligence work, visual inspection of the terrain and changes in vegetation as means of discovery of hidden graves) and new (specially trained dogs, chemical sensors, ground penetrating radar, electrical resistivity tomography, magnetometry and magnetic susceptibility measurement, soil sampling, gas chromatography combined with mass spectrometry, methods based on the ninhydrin reaction, optical remote sensing, hyperspectral aerial imaging, spatial laser scanning – LiDAR) methods of the hidden graves investigation. Conclusions: New methods in forensics investigations of hidden graves give more concrete and more precise data than the classical methods, and their application depends on the type of the burial, soil composition and time elapsed since the time of the burial or death. Classical methods will continue to be used in forensic investigations of hidden graves and their value will become even more important in synergy with some of the new methods.