US Navy

The US Navy in The Fifth Day is more than a military backdrop: it is an institution whose technologies and decisions shape the human response to a crisis emerging from the sea. Its reach extends from low-frequency ocean surveillance and dolphin programs to the specially equipped USS Independence LHD-8. Yet the novel also makes the Navy's control appear uncertain. Sonar may injure the animals it is meant to detect, while military attempts to direct marine mammals expose a troubling resemblance between the crisis and the human methods devised to answer it.

Surveillance and the sonar dispute

The Navy's SURTASS LFA system is described as a low-frequency active sonar developed for detecting submarines and being tested in multiple locations. Rod Palm says that the American government authorized the Navy to use it, while Leon Anawak describes the scale of its surveillance reach: the system could place eighty per cent of the world's oceans under observation. The discussion emphasizes the tension between the stated strategic purpose of tracking submarines and the broader capacity to monitor a vast marine environment. The system's reported cost, three hundred million dollars, underscores how much institutional investment rests on the assumption that its use is acceptable.

That assumption is challenged by the reported effects of underwater sound. Anawak argues that sound at 180 decibels can rupture a whale's eardrums and that a transmitter can generate 215 decibels. The dialogue presents these figures as part of a dispute over what the Navy's equipment means for marine life, not as a settled account of every incident. Palm recalls earlier experiments with sonar that coincided with increased whale and dolphin strandings around the world. The dead animals, he says, showed signs of bleeding in the brain and inner ear consistent with noise damage; environmental advocates also connected some strandings to nearby North Atlantic Treaty Organization exercises.

The novel stresses that the Navy had long denied a connection between sonar and strandings, before acknowledging that sonar had caused some cases. Even then, the available evidence remained incomplete: Palm points out that damage was known primarily through examination of dead whales, and that competing explanations persisted. Ray Fenwick's theory that underwater noise could trigger collective madness is presented as one hypothesis among several, rather than as an established conclusion. The uncertainty matters. The Navy's equipment is implicated in possible harm, but the difficulty of observing and diagnosing events underwater leaves room for institutional denial and scientific disagreement alike.

Marine mammals as military instruments

The account of military marine-mammal programs broadens the issue from surveillance to direct control of animals. While investigating the subject, Anawak finds public information about the US Navy Marine Mammal Program, then searches beyond the Navy's own website for details not included in its official presentation. He also learns of a former Soviet program in which dolphins, sea lions, and belugas were trained to locate mines and recover lost torpedoes, with some reportedly deployed to defend warships in the Black Sea. After the Soviet Union's collapse, the animals were transferred to an oceanarium in Sebastopol; according to the account Anawak reads, financial hardship later scattered them among other destinations, including therapy centres and Iran.

Anawak's research leads him to suspect that military interest in marine mammals extends beyond the public account. He connects the programs to neural research associated with John Lilly and to the military value of echolocation, which he describes as a sonar capability that outperformed human inventions and remained incompletely understood. The narrative frames further experimentation as a reason for suspicion, not as proof that every rumored program existed. That distinction preserves the difference between documented public history, Anawak's investigative conclusions, and indications of secret work.

Jack Greywolf gives a more specific account of American dolphin operations. He describes dolphins being used to guard harbours at Cam Ranh Bay during the Vietnam War and says that the Navy's public telling omitted the Swimmer Nullification Program. In his account, the animals were trained for dangerous operations against divers, and some were equipped to carry weapons or deliver substances. Greywolf characterizes this as a transformation of animals into instruments of lethal force. The episode complicates any simple division between human intelligence and animal behavior: the Navy's program depends on abilities that humans do not possess in the same form, but seeks to redirect those abilities toward military objectives.

Greywolf also recalls seeing dolphins subjected to a neural procedure in San Diego in 1989. His description says that electrodes were inserted to stimulate the brain with electrical currents, and that the animals were conscious during the procedure. The novel offers this as his recollection, not as an independently verified institutional record. Its importance lies in the contrast between the language of experimentation and the visible resistance he remembers: a research subject becomes an animal whose behavior cannot be reduced to the intended procedure.

Command and preparation for the Greenland Sea

The Navy's response to the marine crisis becomes tangible aboard USS Independence LHD-8. Samantha Crowe arrives at the ship in the Greenland Sea, about 950 kilometres northeast of Iceland, over the Arctic Ocean's deep-sea basin. The carrier is described as a floating city, but its immediate complement is unusually small: it can accommodate three thousand men, while barely two hundred are aboard for this mission. The contrast between the vessel's scale and its limited crew gives the expedition a provisional, specialized character rather than the feel of ordinary deployment.

The ship was adapted for a mission shaped by the possibility of dangerous encounters at sea. Salomon Peak explains that the planners wanted a vessel heavy enough to withstand severe waves and threats from sea creatures, with advanced communications, aircraft landing points, and a dive station. The well deck was redesigned as part of the modifications. The intended use of an amphibious assault ship thus shifts from carrying landing craft and hovercraft toward supporting maritime investigation and intervention. USS Independence LHD-8 becomes military infrastructure repurposed for a problem that does not fit neatly into conventional warfare.

Luther Roscovitz, a submarine commander, is entrusted with outfitting the dive station after the expedition is approved. He is given broad authority to buy useful equipment at any price or commission new equipment, provided it can be built before departure. Roscovitz rejects the idea that machines alone can carry out the mission. His planning includes remotely operated and autonomous vehicles, armed crewed submersibles, and a dolphin fleet; MK6 and MK7 are assigned at a scientist's request. His position gives the Navy's response a distinctly human and animal dimension: remote systems can gather information, but Roscovitz believes that people may ultimately have to descend and make decisions themselves.

Institutional reach and unresolved tensions

The Navy's role therefore spans observation, research, procurement, and force. In one strand, SURTASS LFA extends surveillance across ocean space while raising the possibility that the same acoustic power harms whales. In another, dolphin programs turn marine perception and movement into military capability. On USS Independence LHD-8, the institution assembles ships, equipment, scientists, and animals for an expedition into the Greenland Sea. These are not separate portraits of an organization so much as linked expressions of its effort to make an unfamiliar ocean legible and manageable.

The novel does not present that effort as straightforward mastery. The ocean's depth and scale limit what can be observed; even evidence of sonar injury is incomplete, and the military's own record is contested by investigators and witnesses. Nor does equipment guarantee control: the ship is prepared against threats that its planners cannot fully define. In that setting, the Navy's immense technical capacity becomes double-edged. It can extend human reach into the sea, but its instruments and assumptions may also intensify the conflict it hopes to contain. The organization stands at the center of the human response precisely because it can mobilize so much—and because the story repeatedly shows how little that mobilization can settle.