Any frogman can operate efficiently in clean water, under optimum conditions, but the Undertow are especially trained to function and fight in the murky, polluted waters that clog busy industrial and military waterfronts. His wet-suit is made of a nontoxic, anti-corrosive material. His face-mask is coated with silicone to repel oil slicks, and is organically conditioned against hostile biological agents and infections.

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