Sound travels differently underwater. A diver senses every sound as if the source is from their own head and all sound sort of blends into one. A whale has a mu

Sound travels differently underwater. A diver senses every sound as if the source is from their own head and all sound sort of blends into one. A whale has a much easier time distinguishing different auditory signals underwater then a diver does. Furthermore, a whale can probably sense the direction the sound comes from and how fast it is moving. A diver failing to notice a giant ship is no evidence that a whale will.