The creatures were approaching perilously close before I dropped through the hatchway and slammed down the cover. Then I went into the tower and ordered full speed ahead, hoping to distance the fearsome things; but it was useless. Not only could any of them easily outdistance the _U_-33, but the further upstream we progressed the greater the number of our besiegers, until fearful of navigating a strange river at high speed, I gave orders to reduce and moved slowly and majestically through the plunging, hissing mass. I was mighty glad that our entrance into the interior of Caprona had been inside a submarine rather than in any other form of vessel. I could readily understand how it might have been that Caprona had been invaded in the past by venturesome navigators without word of it ever reaching the outside world, for I can assure you that only by submarine could man pass up that great sluggish river, alive. We proceeded up the river for some forty miles before darkness overtook us. I was afraid to submerge and lie on the bottom overnight for fear that the mud might be deep enough to hold us, and as we could not hold with the anchor, I ran in close to shore, and in a brief interim of attack from the reptiles we made fast to a large tree. We also dipped up some of the river water and found it, though quite warm, a little sweeter than before. We had food enough, and with the water we were all quite refreshed; but we missed fresh meat. It had been weeks, now, since we had tasted it, and the sight of the reptiles gave me an idea—that a steak or two from one of them might not be bad eating. So I went on deck with a rifle, twenty of which were aboard the _U_-33. At sight of me a huge thing charged and climbed to the deck. I retreated to the top of the conning-tower, and when it had raised its mighty bulk to the level of the little deck on which I stood, I let it have a bullet right between the eyes. The thing stopped then and looked at me a moment as much as to say: “Why this thing has a stinger! I must be careful.” And then it reached out its long neck and opened its mighty jaws and grabbed for me; but I wasn’t there. I had tumbled backward into the tower, and I mighty near killed myself doing it. When I glanced up, that little head on the end of its long neck was coming straight down on top of me, and once more I tumbled into greater safety, sprawling upon the floor of the centrale.