The Devil & Sherlock Holmes

then, most people thought they were only near the bottom,” he said. Robison later dissected the tentacle and performed chemical analyses; the consistency of the tissue, and its high level of protein, led him to speculate that the giant squid was “a relatively strong swimmer.” Robison told me that he had taken a bite of its raw, rubbery flesh. “How could I not?” he said, adding, “It was bitter.”

When I arrived at the institute, Robison and his squad were already on board the ship. The vessel was named the Western Flyer, for a fishing vessel that John Steinbeck had sailed on during a 1940 expedition, a journey he later chronicled in “The Log from the Sea of Cortez.” The Western Flyer was one of the most incredible ships I had ever seen. It was a hundred and seventeen feet long, with three layers of decks, and it had an unusual rectangular shape. Its boxlike frame rested on two pontoons, each running the length of the boat, allowing the Western Flyer to remain almost still in the roughest seas.

There were twenty-one people in Robison’s squad, among them computer scientists, marine biologists, chemists, and engineers. To my surprise, there seemed to be no one on deck when I stepped on board. As I opened the main door, though, I was greeted by a clatter of men and machines. In the center of the cavernous room, surrounded by crewmen communicating through headsets, was the remotely operated vehicle, or R.O.V. It was hanging from a cable attached to a crane; it was the size of a Volkswagen and weighed some eight thousand pounds. At first glance, it appeared to be nothing more than a jumble of wires. The front of the machine, or at least what I presumed was the front, had two large spotlights, which could be rotated. On the top of the machine was an outer shell with a single word painted on it: “TIBURON,” Spanish for “shark.”

“Welcome aboard,” Robison said.

Robison was standing near the R.O.V., coordinating much of the activity. He resembled an eighteenth-century whaling captain, with white hair and a white beard; even his eyebrows were inordinately thick and wild. He began to explain how the robot operated: a coated fiber-optic wire connected the ship to the R.O.V., sending signals back and forth. The machine was propelled by electric thrusters and had flotation devices that allowed it to hover with neutral buoyancy, much like a giant squid, despite weighing four tons. What’s more, the R.O.V. was outfitted with eight cameras, providing, as Robison put it, “a complete portrait of a three-dimensional universe.” He added, “Our mandate is to go and see what no one else can.”

He led me around the rest of the ship, which had a dining room, a computer room, a laboratory, and a freezer for preserving specimens. On the upper deck, along with the bridge, were quarters equipped with televisions, which displayed the Tiburon’s live feed. “The dirty secret is that you never have to get out of bed,” he said. He left me to settle in my own private room. I soon realized that the boat had already set sail: it cut so smoothly through the water that I hadn’t noticed it moving.

That afternoon, we drifted over the Monterey Canyon, and stopped to make our first probe. A team of half a dozen engineers and technicians prepared the Tiburon.

“How do we look on the starboard camera?” one asked.

“Good to go.”

“Do you have thrust?”

“Roger that.”

The crew stepped back and the lights on the Tiburon began to blink. A trapdoor slowly opened, revealing the ocean beneath, and the Tiburon hovered above it like a spaceship. The crane then lowered the R.O.V. into the turbulent water, its snubbed head pitching forward, its fiber-optic cable trailing behind it, like an endless tail.

I walked toward the stern and into the control room, where I expected to find Robison. It was dark, except for nearly two dozen glowing monitors, which broadcast color images from the Tiburon’s myriad cameras, each one capturing a different angle. Robison sat beside the pilot, who steered the R.O.V. with a joystick.

Strange gelatinous creatures began to appear, which gave off dazzling displays of bioluminescence. There was a crustacean that walked through the water like a daddy-longlegs spider, and fish with jaws that were unhinged. There was a Tiburonia granrojo, a red balloon-like jellyfish that Robison and his squad had discovered and named for the R.O.V., and that was one of hundreds of new species that the squad had uncovered. There was a diaphanous animal, which they still hadn’t identified, and called simply “the mystery mollusk.” And there was, when the Tiburon reached the soft, craggy bottom of the ocean, a constant snowfall of decomposing skeletons and microscopic organisms.

Over the next several days, as the Tiburon descended as deep as two miles, we saw hundreds of squid: blue-eyed ones, translucent ones, polka-dotted ones. Observing these squid in their natural habitat, Robison said, provided clues to the behavior of their giant relative. When a camera zoomed in on an individual squid, we could see water entering the muscular sac, or mantle, that contains the squid’s internal organs; it then inflated and contracted, shooting the water out through a funnel and propelling the squid like a bullet through the ocean. Watching the animals outrace the robot, I had a sense of why Clyde Roper once said of squid, “The only ones you catch are the slow, the sick, and the stupid.”

Another reason for their elusiveness is their unusually large eyes, which enable them to discern predators in places where light is nearly absent. (The giant squid’s eyes are thought to be the largest of any animal.) Squid also have highly developed brains for an invertebrate, and have nerve fibers that are hundreds of times thicker than those in human beings—allowing them to react in an instant. (For many decades, neuroscientists have relied on squid neurons for their research.) “By observing squid in their natural habitat, we have discovered that they are much more intelligent, much more complex than anything we suspected,” Robison said.

As we watched, the squid seemed to be using light patterns, colors, and postures as a means of communication. They didn’t just turn red or pink or yellow; ripples of color would wash across their bodies. And they would contort their arms into elaborate arrangements—sometimes balling them together, or holding them above their heads, like flamenco dancers. Robison explained that they use these movements and color changes to warn other squid of predators, to perform mating rituals, to attract prey, and to conceal themselves.

Several times, when the Tiburon got too close to them, the squid ejected streams of black ink. In the past, scientists assumed that it served solely as camouflage or a decoy. Robison told me that he and other scientists now believe the ink contains chemicals that disable predators; this would explain why he has seen deep-sea squid release black nimbuses in depths where there is no light. “As much as we know about squid, we still don’t know that much,” he said.

Robison noted that the behavior of giant squid, in particular, was poorly understood. No one knows just how aggressive giant squid are, whether they hunt alone or in packs, or whether, as legend has it, they will attack people as well as fish. After Robison caught the tentacle and descended in a submersible to the same spot, he said, “It occurred to me that there was a pissed-off squid out there with a grudge against me.” (Other scientists suspect that the giant squid’s violent reputation is undeserved; O’Shea, for one, contends that Architeuthis is probably a “gentle beast.”)

The expedition ended without a glimpse of Architeuthis, but, at one point, several jumbo squid did appear on the ship’s screens. They were only a fraction of the size of a giant squid—between five and eight feet in length and a hundred or so pounds—but they looked frighteningly strong. One night, several of the ship’s scientists dropped a jig, a device specially designed to lure squid, over the side of the boat. They caught two jumbo squid. As they reeled each squid in, screaming, “Pump him up!,” the weight and strength of the animals nearly pulled the men overboard. Several minutes later, Robison and I went to the ship’s laboratory, where a scientist held up one of the jumbo squid. The creature was nearly as long as Robison is tall, and its tentacles were still lashing and writhing. “Now imagine a giant squid with a tentacle thirty feet long,” he said.

After the squid was dissected, part of it was given to the cook. The next day, it appeared on a silver platter. “From beast to feast,” the chef said, as we sat down for supper.

“Shall we take a peek?” O’Shea said, leaning over the stern of the boat. It was after midnight, several hours since we had dropped the traps in the water; the rain had stopped, but a cold wind swirled around us. As the boat rocked in the waves, O’Shea pulled in the line, hand over hand, because the boat didn’t have winches. The traps weighed at least fifty pounds, and he climbed up on the side of the boat to get a better grip, his bare feet spread apart. As the first net emerged from the water, O’Shea shouted for Conway and me to haul it in, and we laid it on the deck, as icy water spilled around our feet. “Hurry, chappies,” O’Shea said. “Get the torch.”

Conway shined the flashlight into the net. There were no squid, but there were swarms of krill, and O’Shea seemed buoyed by the discovery. “We’re definitely in squid eating country,” he said.

He dropped the nets overboard again, anchoring them in place, and began the next phase of the hunt—