Archimedes' principle

Archimedes' principle states that a body immersed in a fluid weighs less by an amount equal to the weight of the fluid it displaces. In the novel, the rule gives a physical explanation for why whales can live at enormous sizes in water but are vulnerable when stranded: their bodies are supported in the sea, while on land their full weight becomes a threat.

Definition and Application

The principle is introduced through an account of whale anatomy and scale. A blue whale measuring thirty-three metres and weighing 130 tonnes is described as four times heavier than the largest dinosaur to walk the Earth; even an orca can weigh up to nine tonnes. Such animals can survive only in water, where the displaced fluid reduces the effective weight their bodies must bear. The explanation turns an abstract physical rule into a condition of animal life.

The passage also clarifies that a whale’s insulating blubber can become dangerous outside its aquatic environment. On land, a stranded whale may be crushed under the pressure of its own weight; the blubber can also retain environmental heat and contribute to overheating. The account therefore connects buoyant support to the broader dependence of a whale’s body on water, without treating the principle itself as an explanation for every cause of stranding or death.

The Whale’s Death and the Rule’s Limits

The discussion occurs during an examination of J-19, an orca that had died at twenty-two, younger than the approximately thirty-year lifespan given for healthy orcas. The animal showed no external signs of a struggle, and the proposed cause was bacterial infection associated with the broader pattern of collapsing immune systems in whales. That diagnosis distinguishes J-19’s death from the physical dangers of stranding: Archimedes' principle explains why a whale’s weight becomes hazardous out of water, but it does not account for this orca’s suspected infection.

Water as a Physical Environment

Elsewhere, the novel presents water as a medium whose physical conditions shape both human knowledge and large-scale events. The continental shelf is described as the underwater continuation of the continental plate, generally no more than two hundred metres deep, with the seabed dropping beyond it toward the ocean floor. In a separate account of a continental-slope slide, the displaced seabed lowers the sea level over a wide area and sends a wave outward; when that wave reaches shallow shelf water, its behavior changes. These passages do not invoke Archimedes' principle, but they place its explanation of bodily support within a world where water and seabed actively condition what can happen.

The principle’s narrative value is its precision: the sea is not merely a setting for whales, but the physical medium that makes their extraordinary size sustainable. The same dependence also marks a limit. Remove the support of water, and a body adapted to aquatic life becomes vulnerable to forces that its ordinary environment had concealed.