The cold that had so frightened me had now given way to almost normal temperature. There was no longer the sound of sizzling steam from the unexplored passage-way. I followed this and presently came upon another chamber filled with machinery. In one corner a huge engine, covered with frost, gave off a chill greeting. On the floor was a steaming puddle of liquid, but the breath of this steam cut like a blizzard. At once I guessed it. This was a liquid air engine. The dead engineer in the corner helped reveal the story. With his death from the penetrating gas, something had gone wrong with the engine. The turbine head had blown off, and the conveying pipe of liquid air had poured forth the icy blast that had so nearly frozen me along with the corpses of the Germans. But now the flow of liquid had ceased, and the last remnants were evaporating from the floor. Evidently the supply pipe had been shut off further back on the line, and I had little time to lose for rescuers were probably on the way. Along one of the corridors running from the engine room I found an open water drain half choked with melting ice. Following this I came upon a grating where the water disappeared. I jerked up the grating and dropped a piece of ice down the well-like shaft. I hastily returned and dragged forth the corpse of my double and with it everything I had myself brought into the mine. Straightening out the stiffened body I plunged it head foremost into the opening. The sound of a splash echoed within the dismal depths. I now hastened back to the chamber into which I had first fallen and destroyed the scaffolding I had erected there. Returning to the desk where I had found the man whose clothing I wore, I sat down and proceeded to search my abundantly filled pockets. From one of them I pulled out a bulky notebook and a number of loose papers. The freshest of these was an official order from the Imperial Office of Chemical Engineers. The order ran as follows: Capt. Karl Armstadt Laboratory 186, E. 58. Report is received at this office of the sound of sapping operations in potash mine D5. Go at once and verify the same and report of condition of gas generators and make analyses of output of the same. Evidently I was Karl Armstadt and very happily a chemical engineer by profession. My task of impersonation so far looked feasible--I could talk chemical engineering. The next paper I proceeded to examine was an identification folder done up in oiled fabric. Thanks to German thoroughness it was amusingly complete. On the first page appeared what I soon discovered to be __ pedigree for four generations back. The printed form on which all this was minutely filled out made very clear statements from which I determined that my father and mother were both dead.