The actual potential danger in the event of an accident with an e-car is still relatively unknown, but unsettling images of e-vehicles on fire are already widespread. We know that the energy storage systems of e-vehicles based on lithium-ion technology behave differently than conventional car engines in the event of a fire. But what exactly happens when e-vehicles catch fire in a tunnel? How hot does it get and what gasses are produced? What dangers are there for people who are in the tunnel at the time of the accident? What risks are emergency personnel exposed to? What damage is there to the tunnel infrastructure? And what is the most efficient way for fire services to extinguish a burning e-vehicle in a tunnel?