Although I was deeply interested in everything that went on under the sea in that craft, my eyes were continually on the captain, who looked like a photographer about to take the picture of a wilful baby. The skipper's face was concealed behind two black canvas wings of the reflector, which keep the many electric lights aboard from interfering with his view through the glass. I then noticed a door in the stern of the craft--about amid-ships--a door which is closed on the sight of danger. To me it looked like a reflection, but you soon find out that you are looking at the engines of the submarine. There, four or five men, ignoring whether they were under the water or on the surface, were concentrated on their work. One mistake, and the submarine and its crew are lost. Hence there is no inattention to duty. Finally, this door was slammed to. The air below is not much different to what it is when the vessel is on the surface--or not noticeably different until the craft has been submerged for several hours. It is then that the "bottles" or air tanks are brought into play. I walked to the bows of the boat, where a giant torpedo was greased and ready for the shutting of its compartment. The air-tight tube was then locked down, and the missile was ready for its victim. But, as I said, lured as you may be to gaze at the other parts of the wonderful craft, you will find that your gaze comes back to the captain--always at the periscope, hands on those brass bars that turn the periscope, and eyes glued to the reflector. "Lower periscope!" he orders. And then: "Raise periscope!" He gives these orders with clearness; not surprising, as no command must be misunderstood when you are 25 or 30 feet under the water. "Lower periscope!" A man in a corner, next to one who has charge of the gyroscopic compass, turns a handle, and the greased steel cylinder sinks until the captain, who had been stretched with toes tipped, now is on bended knees, his hands extended to stop the periscope man from taking the "eye" further down. The captain turns the periscope around, scanning the waters. At his right, when the skipper is facing the bows, is another officer, with his hand on the trigger of what looks like an upward-pointed pistol of brass and steel. This officer waits for the command to send off the torpedo. "Lower foremost periscope into the well," ordered the captain. This periscope was not in use and had not been above the surface. It is the duplicate "eye," in case the other is out of order. "Yes," said the captain, not looking at me, "she's mostly guts below. Have a look at that destroyer. We are going to send a practice torpedo at her, and she will pick it up and return it when we get back home."