Much of the research studies carried out in the past on tunnel fires are related to completed tunnels, i.e. when the tunnels are in operation. Although worldwide mechanized tunnel excavations are increasing every year, not much work is seen on the fire safety issues related to the construction of such tunnels. At the other end, the introduction of plows and shearers in mining with cutting power of more than 1000 kW and associated equipment like panzers and belt conveyors started in the mid-1960s. As a consequence, the need to evaluate the effect of this new technology on fire hazards in explosive gas medium emerged, leading to detailed research works which also helped to manage tunnel fire risks during tunnel boring machine (TBM) drives. In the light of experiences gained on methane/dust explosions, conveying belt fires in Turkish Coal Mines, and fires generated thereafter, guiding principles of managing the risk of tunnel fires during TBM excavations are developed and are discussed in this paper. Special attention is attired to two EPB TBMs excavating in the new Istanbul Airport Metro project under risk of methane explosion.