Then came the tramp of many feet. Not knowing whether they had been "spotted" by a keen-eyed sentry, Hamerton and his comrade remained on the thorns of expectancy. Alternate hopes and fears flashed across their minds in quick succession. Detroit was mentally bemoaning the rashness that prompted Hamerton to suggest the exploration of the aircrafts' subterranean shelter instead of making for the base of the cliffs; while the latter regretted that he had not been able to continue his nocturnal tour of investigation.
Yet, although men were running hither and thither, none came across the floor of the turntable. Trucks were rumbling along the tram lines, men were shouting in guttural tones, electric motors were whizzing and buzzing. The place, hitherto practically deserted, resembled a gigantic beehive.
"They are not looking for us," whispered the Sub. "They are evidently getting one of the Zeppelins ready for a flight. I hope we won't be disturbed. We may as well have a tour round our limited quarters, to make ourselves acquainted with our hiding place."
"Go steady," cautioned Detroit.
"Trust me for that," rejoined Hamerton, "We don't want to electrocute ourselves, or start the turntable spinning round at the rate of knots."
"Like a new form of joy-wheel," added the American. "It would be a bit of a joke to see the soldiers attempting to reach the traphatch with the platform spinning round at twenty miles an hour."
Their eyes were now getting accustomed to the gloom, for there was a fair amount of reflected light that at first was almost unnoticeable after the powerful glare without.
The place of refuge was certainly expansive, but much of the space was taken up with complicated machinery. The turntable itself worked on steel rollers set in a "race", the upper bearing surface consisting of steel skeleton trestles, which in turn supported the revolving platform. Between the latter and the edge of the circular concrete wall was a width of less than eight inches, insufficient to allow a man to crawl through. The only means of gaining the machinery chamber was by the two trapdoors.
"Shall we barricade the hatchways?" asked Detroit.
"No use," replied Hamerton. "It would only arouse suspicion. Then we should either be starved out or run the risk of being potted, for the floor is not proof against rifle fire. No, the best thing we can do is to keep quiet. Should anyone come we must endeavour to dodge behind some of this gear."