Another more serious explosion occurred on one of our large cruising submarines at the New Admiralty Works in Russia, which was due to a combination of both carelessness and ignorance. In this instance, gasolene had been sent down to the Admiralty dock for conducting dock trials of the engines. When the fuel arrived, the boat was full of workmen, carpenters, pipe-fitters, machinists, etc., but, notwithstanding the fact that there were rules posted that all men should leave the boat when taking on gasolene--except an inspector, who should check up to see that the proper valves were opened and everything tight--the quartermaster in charge of the labor crew, without notifying anyone in charge or anyone aboard the boat, connected up with the supply system and started pumping the gasolene into the boat. The engine was then running and charging batteries. Now it appears that one of the naval officers had--also without notifying the engineer--ordered a section of the filling pipe taken down for the purpose of having a branch pipe connection made in order to carry some additional fuel in the centre ballast tank--something we did not approve of; so, when the gasolene was pumped into the boat, instead of going into the proper tanks it ran out on the floor of the conning tower, then down through some openings for electric wires that had not yet been sealed, over the switchboard, and collected in a large puddle on the floor. One of the Russian electricians, who had been aft adjusting the dynamos, finally noticed this gasolene running down over the switchboard and cried out in Russian, "Quick, leave the boat for your lives!" and in his excitement he pulled the switch through which the dynamos were charging the batteries. This created a spark, which was all that was needed to create an explosion. Fortunately, this was a large boat and she had three exit hatches, all of which were open. A number of men were just in the act of going through the hatches; they were blown up into the air twenty-five or thirty feet, according to some observers, two of them falling into the water, from which they were rescued. Many of the men were seriously burned, but none fatally. Those most seriously injured were those near the hatches, as the flash of flame rose toward the hatches, the openings being the line of least resistance for the compressed air and gases. The men in the ends of the boat were not injured, while those midway between the hatches had about six inches of the bottom of their trousers burned to a crisp, which shows that the heavy gasolene fumes had not yet become thoroughly mixed with the air.