Possible interpretations of fire phenomena during the Yalta earthquakes of 1927Yalta earthquakes of 1927 are considered. It is tempting to explain the fiery phenomenon migrating from north to south to the west of Crimea on September 2 as the release of a huge band of gases along the sub-meridional Nikolaevskiy fault. However, the fault is 100 km distant from Sevastopol and Cape Lukull, meaning that the gas emissions must have been huge to be seen so far away. Another explanation is the ejections passed through a smaller tectonic fault, subparallel to the Nikolaevskiy Fault, but developed much closer to the Crimean coast. Another idea would be the impact of shocks on the gas hydrate field in the northwestern part of the Black Sea. Perhaps the earthquake caused the destruction of the gas hydrates and released powerful gases giving rise to a huge flame. One might also propose an association with the discharge of deep sources of thermal gas, or with the biochemical oxidation of organic matter in bottom sediments of the Black Sea. A review of existing views on the genesis of gas emissions in the Black Sea is provided. The available isotope-geochemical data indicate the predominance of thermogenic methane in the Black Sea—on the shelf, continental slope, and in the basin. For the interpretation and understanding of the nature of the fiery phenomena observed during the Yalta earthquakes of 1927, the conceptual system of hypotheses by (Gilat and Vol, HAIT J Sci Eng B 2:125–167, 2005) is provided. The main source of energy for the Earth’s internal processes is considered to be the induced chain of degassing reactions of hydrogen and helium, the most common and important energy carriers and reservoirs.