To provide a fire extinguishant equipment (natural penetration, submerging system) which, on a fire occurring inside (various kinds of) machines, naturally extinguishes the fire and prevents flying sparks and spreading flames, can save time in extinguishing the fire, can be simply installed without a manual operation to achieve miniaturization and cost-reduction in accordance with the inside of the machine, and allows disposing the machine in a wide area depending on the use.

Water and the other fire extinguishant (7) described in the Fire Law are filled in a fire-extinguishant container (8) which can be melted by the heat of the fire. The fire extinguishant (7) together with the melting of fire-extinguishant container (8) which reacts to the fire is penetrated into a fire origin, and also by an effect from the reserved water of a specific amount and the other fire extinguishant the fire origin is submerged and extinguished.