The Pelagic Series IV is a bilateral full leg replacement designed for sustained aquatic operation, featuring a hydrodynamically contoured shell that reduces drag by 40% compared to biological legs in open water. Each foot houses a deployable composite swim fin that extends on command via a wrist-tap or neural trigger, retracting flush for land use without visible protrusion. An internal pressure compensation system equalizes joint cavity pressure at depths up to 120 meters, preventing the joint seizure that destroys standard cyberlimbs at depth.

Stormvein's Pelagic line serves the Great Lakes diving industry, underwater infrastructure maintenance crews, and the small but intensely dedicated community of competitive open-water swimmers who work the Lake Michigan depth circuit. In GLMZ's waterfront districts, the distinctive matte-blue hydrodynamic shell of a Pelagic user is immediately recognizable — and carries significant professional credibility in aquatic trades.