entirely underneath the level of the ground, e.g. air-raid galleries

Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate > against air-raid or other war-like actions > Independent shelters; Arrangement of independent splinter-proof walls > entirely underneath the level of the ground, e.g. air-raid galleries

Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate (foundation aspects E02D) > against air-raid or other war-like actions > Independent shelters; Arrangement of independent splinter-proof walls > entirely underneath the level of the ground, e.g. air-raid galleries