In the fall of 2012, a geophysical crew from Enviroprobe Service Inc. was mobilized to a coastal city in New Jersey to perform a geophysical investigation. The purpose of the investigation was to locate underwater/sub-bottom telephone utilities within a creek. The investigation utilized a cable locator with a submersible antenna, a Geonics EM31-MK2 system, and an EdgeTech 3100 portable sub-bottom profiler system.

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It turned out the cable locator with submersible antenna was the most successful tool for this project. The underwater cables were pinpointed along their routes and their positions were marked on-site with anchored buoys. A high accuracy differential GPS was also used to record their positions. The recorded positions, along with estimated utility depths, were marked on maps for future references.

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The EM31 data confirmed some findings of the cable locator survey. Due to the sub-bottom soil content and cable sizes, no signals indicating presences of cables were observable in the sub-bottom data.