The invention relates to an explosion-proof reinforced-concrete unitised unit, in particular reinforced-concrete unitised-unit transformer station, having a plurality of openings which serve for venting and as hazard protection, are arranged on the ceiling slab, provide connection between the interior and the atmosphere, and are protected from incoming rainwater owing to the inclined arrangement. In the case of said unitised unit, the invention provides that the ceiling slab (2) has a cutout (14) which is closed by a cover (15), and that the openings, which are provided as hazard protection, are designed in the form of at least one slot between the cover (15) and a flange (18) which serves as anti-displacement means for the cover and belongs to the cutout (14), while, for venting purposes, further slots are provided in a cover flange (16) which, in the case of the anti-displacement means for the cover, interacts with the cutout flange (18) and, for protecting the unitised-unit interior (25) from rainwater, said further slots are provided with an outwardly directed gradient. IMAGE
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