He pushed the joke a little further. "Turn your periscopes on the blade Murderer's wearing! John Paul Jones used to issue those for cutlasses! Murderer's hoping to fight the sea serpent hand to hand." His grin widening with embarrassment, the Murderer felt called upon to retort. "I'll give you a better suspect for stealing our picket buoys. Santa Claus. These are his territorial waters. Are you aware that in the Middle Ages Santa Claus was the patron saint of thieves?" "Now, Mr. College Boy," Barney began, "you just want to show us you also studied history, not just marine biology. This boy will even tell you a long Latin name for a little something that floats like dandruff in the water." A touch of pride appeared in Barney's voice. "He can tell you its whole life history and what eats it and why it's important and why it will be a lot more important fifty years from now when _your_ kids will need a lot more food from the sea." There was a perceptible slowing, and the weird sound from the atomic submarine's heat-exchanger muted. Barney glanced at his pressure-proof watch. The Murderer tensed. "This college boy may look like a tennis player," Barney went on as if nothing had happened, "but in the water, when Murderer sees something swimming down there, he doesn't care how big it is. We were installing the broadcast aerial from a picket buoy up through ice, and Murderer had just retracted the magnesium flare pole, so I'm half-blinded. I look down. I see something so big I want to get out of there on a bicycle. But down Murderer swims with the magnesium flare in one hand and his cutlass in the other. It's a shark as big as a small whale. The flare hypnotizes it, and round and round they go, with Murderer stabbing away, letting in sea water, until that shark bugs out of there like a bare-bottomed boy from a swarm of bumblebees!" The Murderer studied his depth gauge to cover his embarrassment. The reason the shark had been so big was that it belonged to a species with the whale-like habit of straining the water for minute crustaceans. It was harmless and had winced from his first thrust. Then its shagreen hide had tensed to armor-toughness, and it had been like trying to stab a submarine. It left because it had no reason to stay. "I'm _relieved_," one of the submariners laughed, "that stabbing _fish_ is how he got the name Murderer." "Not only fish," Barney went on enthusiastically. "This boy almost got himself court-martialed. We're working from the icebreaker, out from Point Barrow, diving from a whaleboat, and before the Annapolis ensign can say a word, Murderer's over the side. We put our face-plates in the water. He's bubbling down on a walrus! I swear, he rides it like a bucking horse. You need a long blade in the arctic. And ugly--when we bent a cable to that walrus from the icebreaker, the walrus stalled the winch!" "What about tusks?" a submariner's voice asked. * * * * *