Again I stood to one side while the soldiers hastened through on the new way. Some two thousand must have passed at a rapid run, when the stream ceased, but I was not sure that all had been rescued who had not passed the point of origin of the flames, and so to assure myself that no poor devil was left behind to die a horrible death, unsuccoured, I ran quickly up the gallery in the direction of the flames which I could now see burning with a dull glow far ahead.
It was hot and stifling work, but at last I reached a point where the fire lit up the corridor sufficiently for me to see that no soldier of Helium lay between me and the conflagration--what was in it or upon the far side I could not know, nor could any man have passed through that seething hell of chemicals and lived to learn.
Having satisfied my sense of duty, I turned and ran rapidly back to the corridor through which my men had passed.
To my horror, however, I found that my retreat in this direction had been blocked--across the mouth of the corridor stood a massive steel grating that had evidently been lowered from its resting-place above for the purpose of effectually cutting off my escape.