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When the Hawaiian Electric Co. Inc. (HECO; Honolulu, Hawaii, U.S.) was awarded the US$22 million contract to install a substation and underwater power line connections for the U.S. Navy's planned comprehensive redevelopment of historic Ford Island, a mile away from Oahu across historic Pearl Harbor, it was obvious that a lot of things were going to have to happen in close sequence and within very tight parameters.
First of all, the mile-long 46-kV cable pull 30 ft (9 m) below the seabed and 70 ft (21 m) below sea level would have to avoid the submerged historic battlewagons Arizona and Nevada that still lie on the harbor's bottom.
HECO...