Get Closer to Aquatic Life with Hecs Stealth Dive Apparel. Get Closer to Aquatic Life with Hecs. Many Marine Animals can Detect and React to Electric Signals. Hecs Stealthscreen is made from Conductive Carbon Fibers Uniquely Woven to Act as a Faraday Cage to Block the Human Electric Signal. Hecs is Designed to help Divers, Underwater Photographers and Researchers Experience Marine Life in its Natural Undisturbed State. us Patent # 8203129; Brands: Hecs Stealthscreen; Sharkskin Covert Hecs; Neptune Hecs, Scuba Gear ...