Sharks have great hearing, and it's usually the sense they employ first when they're on the hunt because sound travels so well underwater. Sharks can start to pick up underwater noises farther away and at lower frequencies than people can, and those wavelengths are just the ones that are often most helpful in the ocean depths. For example, the sounds from swimming usually register in this range.
Next comes scent. Sharks have a renowned talent for sniffing out the tiniest quantities of chemicals in the water surrounding them, but not over extremely vast distances -- they tend to max out at around 450 yards (411 meters). They focus in on an odor by swinging their heads from side to side as they swim, so that their powerful nares can zone in on the source of the smell. Swimming into the current is another common shark strategy -- it's often the direction a scent is arriving from.
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