In my mid-20s, I spent three months living in Broome, a coastal township in Western Australia famous for its moonrises, pink beaches, and pearl farms. Each morning during what is known locally as “the buildup” (the hot, muggy weeks heralding the wet season), I would stuff a towel in a bag and trudge out to where the red pindan soil—distinctive to the Kimberley region—marbles powdery dunes, longing to dunk my body in the postcard sea. Often, I could go no farther than the water’s edge. Signs pitched by lifeguards along the beach showed a stick figure lashed by a mass of tentacles: Irukandji jellyfish. By midday, the mercury might have drifted above 100 degrees Fahrenheit, and still no one would dare to even dabble in the shallows of the jade ocean—corduroyed by waves—knowing that Irukandji had been detected. Back from the shoreline, a few tourists resolutely sweated their silhouettes onto beach chairs. If the notices were plucked from the sand in the afternoon, a tense choreography would ensue. Each heat-strained person would approach the surf and make an elaborate pantomime of applying sunscreen or stretching out hamstrings, hoping not to have to be the first to get in. The most common Irukandji, Carukia barnesi, are the size of a chickpea, and because they’re colorless, in the ocean they’re more or less invisible. The smaller ones might appear to you as the residue of a sneeze. The Irukandji’s translucent bell, shaped like a tiny boxing glove, trails four tentacles, delicate as cotton thread and about three feet long. The jellyfish’s sting doesn’t hurt overmuch. The pain is perhaps equivalent to a mild static zap from a metal doorknob—hardly even enough to make you want to suck your finger. The C. barnesi does not leave red welts, as other jellyfish do. You might miss the prick of its microscopic, stinging darts. You might think it’s just the start of sunburn. Worst-case scenario: You’re dead by the following sunset. There are thought to be 25 species of Irukandji. One species, Malo kingi, is commonly known as “the king slayer.” After the initial sting comes a procession of ever more dreadful symptoms: back pain, agitation, the sensation of crawling skin, vomiting. The heart can become arrhythmic. Fluid may build up in and around the lungs. Patients “beg their doctors to kill them, just to get it over with,” the marine biologist Lisa-ann Gershwin told ABC Radio National in 2007.
Read More: The Atlantic