Your best chance of surviving a shark attack comes down to staying calm, fighting back hard if bitten, and controlling bleeding immediately after. Shark attacks are rare, with about 65 unprovoked bites recorded worldwide each year and an average of eight fatalities, but knowing exactly what to do in those critical seconds and minutes can save your life.
Before Contact: How to Respond to a Circling Shark
If a shark is approaching but hasn’t made contact, the single most important thing you can do is maintain eye contact. Field tests with Caribbean reef sharks found that sharks came significantly closer to divers when eye contact was broken, and also slowed down as they closed in, a behavior consistent with a predatory approach. When divers held steady eye contact, sharks stayed farther away and were more likely to turn off their approach path. Even at close range, breaking eye contact encouraged sharks to press closer.
Keep your movements slow and controlled. Thrashing, splashing, or swimming frantically mimics the behavior of injured prey, which is exactly what triggers a shark’s hunting instinct. Face the shark, keep your body vertical if possible, and back away steadily toward shore, a boat, or any solid structure. If you’re with other people, group together. Sharks are far more likely to investigate a lone, isolated figure.
During a Bite: Where and How to Fight Back
If a shark bites you, passivity is not an option. You need to fight, and you need to target the right spots. The nose, eyes, and gills are the three most vulnerable areas. The shark’s snout is packed with nerve endings, so even a moderate strike there causes real discomfort. Think of it as the equivalent of being hit in a deeply sensitive spot: the shark doesn’t want to deal with prey that fights back.
In practice, the nose is the easiest target to reach. The eyes and gills are effective too, but they’re harder to hit precisely when you’re underwater and panicking. Gouge, punch, claw, or strike with whatever you have. If you’re holding a surfboard, paddle, camera housing, or dive knife, use it. Aim for the nose or eyes with the hardest edge of whatever is in your hands. Surfers can use the tail or fin of their board as a barrier or striking tool. Kayakers and paddleboarders should use their oar, keeping their limbs inside the vessel if possible.
The goal is simple: make yourself more trouble than you’re worth. Most shark bites are investigatory. The shark is figuring out whether you’re food. A strong, aggressive response tells it you’re not.
Getting Out of the Water
Once the shark releases you or backs off, resist the urge to sprint-swim for shore. Fast, panicked swimming creates exactly the kind of splashing and erratic movement that can re-trigger a chase response. Swim firmly but steadily, with smooth strokes, toward the nearest exit point. Keep facing the shark as much as you can while moving away. If you’re bleeding, get out as quickly as you reasonably can, because blood in the water is a powerful attractant. Experiments releasing different substances near tiger sharks found that blood drew 41 shark visits compared to zero for urine and zero for plain water.
If you’re near a boat or a reef, use it as a physical barrier between you and the shark. Anything that breaks the shark’s line of approach buys you time.
Stopping the Bleeding on Shore
Shark bites can cause massive blood loss, and victims can die within five to ten minutes if bleeding isn’t controlled. This is the phase where bystander action saves lives.
Apply direct pressure to the wound immediately using both hands. If the wound is deep, pack a clean cloth or bandage tightly into it and keep holding pressure. Do not use towels for packing: the fabric acts like a sponge and can increase blood loss rather than stopping it.
The most effective tool for a limb wound is a commercial tourniquet, the kind found in trauma or first aid kits. Place it two to three inches above the wound, avoiding joints. If you don’t have a tourniquet, keep the wound packed and maintain firm two-handed pressure until paramedics arrive. If the victim feels weak or is losing consciousness, lay them on their side to keep the airway open. Wrap them in towels or clothing to keep them warm, since blood loss rapidly drops body temperature and can send someone into shock.
Reducing Your Risk Before It Happens
Most shark encounters never escalate to a bite. You can lower your odds further by understanding what draws sharks in. Avoid swimming with open wounds. Stay out of the water at dawn, dusk, and night, when many shark species actively hunt. Avoid areas near fishing activity, where blood and bait are in the water. Shiny jewelry and high-contrast swimwear can catch a shark’s attention in murky water, mimicking the flash of fish scales.
Swim in groups rather than alone, and stay in areas where you can see the bottom. River mouths, sandbars, and steep drop-offs are natural hunting corridors for sharks.
Do Shark Deterrent Devices Work?
Several personal deterrent products are marketed to surfers and divers, but independent testing shows most of them don’t do much. A study published in PeerJ tested five commercially available deterrents against white sharks. Only one, the Ocean Guardian Freedom+ Surf, which generates a strong electrical field, had a statistically significant effect. It reduced the rate of bait-taking from 96% to 40% and pushed sharks farther from the board, increasing average distance from 1.6 meters to 2.6 meters.
Magnetic band products like the SharkBanz bracelet and leash showed no measurable effect on white shark behavior. Neither did a shark-repelling wax product. The electrical deterrent isn’t a guarantee either, since 40% of baits were still taken, but it meaningfully shifts the odds. If you surf or dive in known shark territory regularly, it’s the only category of personal deterrent with real evidence behind it.