Crushing ceiling - The Doom Wiki at DoomWiki
Crushing ceilings are a hazard that appears in Doom, Heretic, Hexen, and Strife. A crushing ceiling cycles between its starting height and eight units above its sector's floor. It damages any players or monsters that happen to be in the space between the two planes. In Doom, barrels explode when crushed, corpses become pools of blood, and weapons and ammunition dropped by monsters will …