The Remora is a semi-autonomous underwater reconnaissance drone developed by Zheng-Dao Bioelectric, designed for operation in GLMZ's submerged infrastructure — the flooded lower transit levels, the polluted harbor channels, the cistern networks beneath the city's industrial sectors. Its hull is modeled on pelagic fish morphology, using a flexible myomer-composite spine and undulating fin drives rather than propellers, which produces almost no acoustic signature and leaves no propeller wash. The Remora moves through water the way an organism does — sinuous, unhurried, and very difficult to detect.

Zheng-Dao's biological engineering background is visible throughout the drone's design. Its sensor suite mimics the lateral line system of fish — a distributed array of pressure-sensitive nodes along its hull that detect water displacement, vibration, and chemical gradients. This allows the Remora to navigate in zero-visibility water, detect the movement of personnel or vehicles at range, and track chemical plumes to their source. The drone's outer skin is coated in a biofilm layer that absorbs sonar pings rather than reflecting them, making it functionally invisible to standard underwater detection systems. Onboard processing handles autonomous navigation, but the drone can accept real-time operator commands through a low-frequency acoustic tether.

The Remora is used by salvage operators, intelligence contractors, infrastructure saboteurs, and anyone with operational interest in GLMZ's submerged spaces. The city's flooded lower levels are largely unmapped and unmonitored — a fact that makes the Remora both practically useful and philosophically significant. In a city where every surface is watched, the water beneath it remains dark.