Project Overview

Con Edison needed to conduct a survey of 20 submarine cables, spanning five locations along the floor of the Harlem River. The cables were live and buried beneath more than 800 cubic yards of contaminated river mud at depths of more than 20 feet.

Safely uncovering them for inspection required MVN to design and fabricate a custom non-conductive dredging system for operation by our divers. We also designed a barge-mounted filtration system that safely decontaminated more than 7 million gallons of river water at a pace of more than 1,000 gallons per minute.

Not only was the project an operational success, but it also met or exceeded all environmental requirements of Con Edison, the New York State Department of Environmental Conservation, and the Department of Environmental Protection.