Cole's knuckles clamped around the grip of the 'Claw of the Abyssal Diver', his fingertips brushing the anti-slip ridges on the handle - a trophy he salvaged from the abandoned 'Abyssal Diver 7' research station in Titan's orbit⚓. In 2419, the Interstellar Salvage Guild strictly prohibited touching the remnants of the old-era deep-sea research, but this dagger, 3D-printed from the keratin fibers of deep-sea pressure-resistant organisms, let him hear the low-frequency hum from the subsurface ocean of Europa when held🔊. He violated the ban and pried open the research station's encrypted compartment, and in the terminal filled with condensate, he found out: this knife was forged by the research team to seal the awakened 'Abyssal Spawn' under the ice, the serrations on the blade can cut through the creature's nerve tentacles, and the holes on the grip are used to inject neurotoxins that suppress such organisms. When Cole clipped the knife to his belt and was about to leave, the ship's alarm suddenly blared, and outside the porthole, dark blue tentacles were wriggling along the bulkhead👾.