Converted Weapon (IM) Ammo

Improvised Munitions (IM) weapons are experimental firearms that manufacture projectiles from materials at hand rather than relying on ammunition carried in advance. Their tactical advantage becomes a threat on the Milne Ice Shelf: pellets that initially resemble hail prove to be precision-made ice bullets, and Rachel Sexton’s recognition of them transforms an unexplained barrage into evidence that a covert military force is attacking the expedition.

Design and Field Use

Rachel is familiar with IM weaponry through her military clearance. The category includes snow rifles that compact snow into ice pellets, desert rifles that melt sand into glass projectiles, and water-based firearms that propel liquid with enough force to break bones. Each design converts the surrounding environment into ammunition, allowing soldiers to manufacture rounds as they fire instead of carrying a heavy conventional supply. In the snow rifle, snow is fed into the rifle’s butt and compressed on demand.

This logistical advantage is also what makes the weapons frightening in the field: a lack of carried ammunition does not impose the usual limit on the number of shots. The terrain itself becomes a source of supply. On the ice, the snow is not merely the attackers’ cover; it is the raw material for their bullets.

Recognition on the Ice

During the assault, a hail of projectiles strikes the expedition’s sled as Rachel and Michael Tolland try to free a tether tangled around its runners. One pellet hits the tarp, partially embeds itself, then bounces onto Rachel’s sleeve. Its scale and finish contradict the appearance of ordinary hail: the ice spheroid is about the size of a large cherry, flawlessly shaped and polished, with a precise seam around its circumference. Rachel recognizes the seam and machined surface as signs of manufacture. The object that seemed to belong to the weather becomes evidence of a weapon.

That recognition changes the meaning of the attack. Rachel knows that the pellets are being produced by an IM weapon, not formed naturally in a storm. Her technical knowledge does not make the scene safer; it narrows the possible explanation to a U.S. Special Ops force, the only forces in the country then cleared to use experimental IM weapons in the field. The knowledge converts confusion into a specific and chilling inference: this is a deliberate assault by a covert military unit, and the likelihood of survival appears close to zero.

Effect on the Attack and Its Victims

The weapon’s projectiles can penetrate the improvised wall of gear piled on the sled. One finds an opening and hits Rachel in the stomach. Even through her padded Mark IX suit, the impact feels like a hard gut punch; her vision fills with stars, and she falls backward, pulling equipment down with her. Tolland drops Norah Mangor’s tether and lunges to support Rachel, but cannot reach her before she and the gear tumble onto the ice. The rifle’s force therefore has an immediate physical consequence even where protective clothing and piled equipment offer partial barriers.

Norah is struck by an ice rifle as well. The pellet leaves a welt on the side of her face and knocks her unconscious; her breathing becomes short and labored. Delta-One approaches her while his teammates keep their rifles trained on the other victims, including the small unconscious man on the ice and Rachel and Tolland behind the overturned sled. The attackers proceed methodically, intending to kill their targets one at a time and leave no trace of how they died. The IM rifle is thus not just a novel means of producing ammunition: it is the instrument that disables the expedition’s people while the covert force controls the scene.

Narrative Significance

The ice bullets make the environment itself part of the attack. Snow, ordinarily the setting and hazard of the expedition, becomes a renewable ammunition source, while the storm-like barrage initially disguises human violence as natural weather. The contrast between a familiar hailstorm and the pellet’s flawless spherical shape gives Rachel a material clue that can be read: the seam exposes the weapon’s manufacture, and her expertise supplies its military meaning.

The episode also makes technical knowledge double-edged. Rachel can identify how the pellets are made and who is authorized to use them, but that understanding reveals the scale of danger rather than a way to escape it. The weapon’s defining advantage—making rounds from local resources—turns the icy landscape into an effectively replenishable arsenal and helps establish why the attack feels so difficult to survive.