 What was the problem with having the fifty-five gallon barrell in the dome?
General Finogenov notified Major Winship that the underground blast was scheduled for the following morning. Next morning, before the sunlight exploded, the four of them donned their space suits and went and sat outside the dome, waiting. The darkness slowly filled with air, and the temperature inside the suit declined steadily. His foot was lifted for the second step when the floor beneath him rose and fell gently, pitching him forward, off balance. "Well," Lt. Chandler commented, "even though we didn't build this thing to withstand a moonquake, it seems to have stood up all right." Air currents whisked it away and plastered it against a riveted seam of the dome. It pulsed as though it were breathing and then it ruptured.
 It took up too much room in an already crowded area.
 It would be impossible to get out once it was inside the dome.  It took up too much room in an already crowded area.  It had a terribly overpowering smell.  It weighed too much to be supported by the dome.