In 2198, the seventh station of the United Government's Abyssal Exploration Program🔬 rests on the seabed 11,900 meters below the Mariana Trench. This "Abyssal Diver Tactical Blade" is an emergency weapon self-made by explorer Carlisle using the station's industrial 3D printer⚔️. The blade is printed from pressure-resistant bioceramic, with a hollowed-out structure calculated by fluid dynamics to reduce resistance in high-pressure water while offsetting hydrostatic stress. The threaded grip was modified by him referencing old-era tactical knives, maintaining a stable grip even when coated in the mucus of abyssal creatures🤜. During a solo mission to sample abyssal native organisms, Carlisle was attacked by a giant tube worm mutated by underwater nuclear waste🐙. The worm's cuticle was as hard as alloy, and the officially issued plasma dagger couldn't penetrate it. In desperation, he drew this self-made blade, and by the cold glow of his helmet lamp, the hollow parts of the blade precisely cut into the joint gaps of the worm's body, and the fluorescent body fluid of the worm seeped out along the hollow patterns🌌. As he stumbled back into the research capsule, he noticed that the patterns on the blade were trembling slightly in response to the low-frequency signal coming from the depths of the abyss, and on the station's radar screen, a cluster of unrecorded blurry light spots was rapidly approaching...